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195665069 = 550135569
BaseRepresentation
bin10111010100110…
…01110010101101
3111122011211000102
423222121302231
5400042240234
631225440445
74564061045
oct1352316255
9448154012
10195665069
11a04a2076
1255640125
13316ca162
141bdb4725
151229ec7e

195665069 has 4 divisors (see below), whose sum is σ = 195706140. Its totient is φ = 195624000.

The previous prime is 195665047. The next prime is 195665081. The reversal of 195665069 is 960566591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 960566591 = 5273182167.

It can be written as a sum of positive squares in 2 ways, for example, as 191462569 + 4202500 = 13837^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-195665069 is a prime.

It is a super-2 number, since 2×1956650692 = 76569638453549522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195665009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12284 + ... + 23285.

It is an arithmetic number, because the mean of its divisors is an integer number (48926535).

Almost surely, 2195665069 is an apocalyptic number.

It is an amenable number.

195665069 is a deficient number, since it is larger than the sum of its proper divisors (41071).

195665069 is an equidigital number, since it uses as much as digits as its factorization.

195665069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41070.

The product of its (nonzero) digits is 437400, while the sum is 47.

The square root of 195665069 is about 13988.0330640158. The cubic root of 195665069 is about 580.5475101473.

The spelling of 195665069 in words is "one hundred ninety-five million, six hundred sixty-five thousand, sixty-nine".

Divisors: 1 5501 35569 195665069