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66121919 = 193480101
BaseRepresentation
bin1111110000111…
…1000010111111
311121102100012222
43330033002333
5113411400134
610321115555
71432012163
oct374170277
9147370188
1066121919
1134362416
121a188bbb
13109115c6
148ad2ca3
155c11a2e
hex3f0f0bf

66121919 has 4 divisors (see below), whose sum is σ = 69602040. Its totient is φ = 62641800.

The previous prime is 66121901. The next prime is 66121921. The reversal of 66121919 is 91912166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66121919 - 28 = 66121663 is a prime.

It is a super-2 number, since 2×661219192 = 8744216344485122, 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 (66121969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1740032 + ... + 1740069.

It is an arithmetic number, because the mean of its divisors is an integer number (17400510).

Almost surely, 266121919 is an apocalyptic number.

66121919 is a deficient number, since it is larger than the sum of its proper divisors (3480121).

66121919 is a wasteful number, since it uses less digits than its factorization.

66121919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480120.

The product of its digits is 5832, while the sum is 35.

The square root of 66121919 is about 8131.5385383087. The cubic root of 66121919 is about 404.3726893700.

The spelling of 66121919 in words is "sixty-six million, one hundred twenty-one thousand, nine hundred nineteen".

Divisors: 1 19 3480101 66121919