65161265531 has 2 divisors, whose sum is σ = 65161265532. Its totient is φ = 65161265530.

The previous prime is 65161265503. The next prime is 65161265549. The reversal of 65161265531 is 13556216156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65161265531 - 2¹⁸ = 65161003387 is a prime.

It is a super-2 number, since 2×65161265531² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65161265581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32580632765 + 32580632766.

It is an arithmetic number, because the mean of its divisors is an integer number (32580632766).

Almost surely, 2^65161265531 is an apocalyptic number.

65161265531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65161265531 is an equidigital number, since it uses as much as digits as its factorization.

65161265531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 41.

The spelling of 65161265531 in words is "sixty-five billion, one hundred sixty-one million, two hundred sixty-five thousand, five hundred thirty-one".