65197816531 has 2 divisors, whose sum is σ = 65197816532. Its totient is φ = 65197816530.

The previous prime is 65197816517. The next prime is 65197816549. The reversal of 65197816531 is 13561879156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65197816531 - 2⁵ = 65197816499 is a prime.

It is a super-3 number, since 3×65197816531³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (65197816231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32598908265 + 32598908266.

It is an arithmetic number, because the mean of its divisors is an integer number (32598908266).

Almost surely, 2^65197816531 is an apocalyptic number.

65197816531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65197816531 is an equidigital number, since it uses as much as digits as its factorization.

65197816531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 52.

The spelling of 65197816531 in words is "sixty-five billion, one hundred ninety-seven million, eight hundred sixteen thousand, five hundred thirty-one".