65997278515 has 24 divisors (see below), whose sum is σ = 92276338752. Its totient is φ = 45181825920.

The previous prime is 65997278513. The next prime is 65997278527. The reversal of 65997278515 is 51587279956.

It is a happy number.

It is not a de Polignac number, because 65997278515 - 2¹ = 65997278513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65997278513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67131 + ... + 369460.

It is an arithmetic number, because the mean of its divisors is an integer number (3844847448).

Almost surely, 2^65997278515 is an apocalyptic number.

65997278515 is a deficient number, since it is larger than the sum of its proper divisors (26279060237).

65997278515 is a wasteful number, since it uses less digits than its factorization.

65997278515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437227 (or 437220 counting only the distinct ones).

The product of its digits is 47628000, while the sum is 64.

The spelling of 65997278515 in words is "sixty-five billion, nine hundred ninety-seven million, two hundred seventy-eight thousand, five hundred fifteen".