78513465231 has 24 divisors (see below), whose sum is σ = 114081327360. Its totient is φ = 52031937600.

The previous prime is 78513465223. The next prime is 78513465253. The reversal of 78513465231 is 13256431587.

It is a happy number.

78513465231 is a `hidden beast` number, since 7 + 85 + 1 + 3 + 46 + 523 + 1 = 666.

It is not a de Polignac number, because 78513465231 - 2³ = 78513465223 is a prime.

It is a super-2 number, since 2×78513465231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78513465271) 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 23 ways as a sum of consecutive naturals, for example, 4681521 + ... + 4698261.

It is an arithmetic number, because the mean of its divisors is an integer number (4753388640).

Almost surely, 2^78513465231 is an apocalyptic number.

78513465231 is a deficient number, since it is larger than the sum of its proper divisors (35567862129).

78513465231 is a wasteful number, since it uses less digits than its factorization.

78513465231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19807 (or 19804 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 78513465231 in words is "seventy-eight billion, five hundred thirteen million, four hundred sixty-five thousand, two hundred thirty-one".