65121938531 has 32 divisors (see below), whose sum is σ = 74274224640. Its totient is φ = 56601379584.

The previous prime is 65121938521. The next prime is 65121938561. The reversal of 65121938531 is 13583912156.

It is a cyclic number.

It is not a de Polignac number, because 65121938531 - 2³⁴ = 47942069347 is a prime.

It is a super-2 number, since 2×65121938531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65121938521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34040831 + ... + 34042743.

It is an arithmetic number, because the mean of its divisors is an integer number (2321069520).

Almost surely, 2^65121938531 is an apocalyptic number.

65121938531 is a deficient number, since it is larger than the sum of its proper divisors (9152286109).

65121938531 is a wasteful number, since it uses less digits than its factorization.

65121938531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715.

The product of its digits is 194400, while the sum is 44.

The spelling of 65121938531 in words is "sixty-five billion, one hundred twenty-one million, nine hundred thirty-eight thousand, five hundred thirty-one".