195916736521 has 16 divisors (see below), whose sum is σ = 232415758080. Its totient is φ = 163098766080.

The previous prime is 195916736507. The next prime is 195916736539. The reversal of 195916736521 is 125637619591.

It is a cyclic number.

It is not a de Polignac number, because 195916736521 - 2²⁹ = 195379865609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (195916736581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14150961 + ... + 14164798.

It is an arithmetic number, because the mean of its divisors is an integer number (14525984880).

Almost surely, 2^195916736521 is an apocalyptic number.

195916736521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

195916736521 is a deficient number, since it is larger than the sum of its proper divisors (36499021559).

195916736521 is a wasteful number, since it uses less digits than its factorization.

195916736521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28315824.

The product of its digits is 3061800, while the sum is 55.

The spelling of 195916736521 in words is "one hundred ninety-five billion, nine hundred sixteen million, seven hundred thirty-six thousand, five hundred twenty-one".