195061661 has 4 divisors (see below), whose sum is σ = 195371424. Its totient is φ = 194751900.

The previous prime is 195061561. The next prime is 195061663. The reversal of 195061661 is 166160591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195061661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195061663) 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, 153935 + ... + 155196.

It is an arithmetic number, because the mean of its divisors is an integer number (48842856).

Almost surely, 2^195061661 is an apocalyptic number.

It is an amenable number.

195061661 is a deficient number, since it is larger than the sum of its proper divisors (309763).

195061661 is an equidigital number, since it uses as much as digits as its factorization.

195061661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309762.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 195061661 is about 13966.4476872253. The cubic root of 195061661 is about 579.9501156066.

The spelling of 195061661 in words is "one hundred ninety-five million, sixty-one thousand, six hundred sixty-one".