78138585613 has 32 divisors (see below), whose sum is σ = 92733621120. Its totient is φ = 65044930560.

The previous prime is 78138585593. The next prime is 78138585617. The reversal of 78138585613 is 31658583187.

It is a cyclic number.

It is not a de Polignac number, because 78138585613 - 2²⁵ = 78105031181 is a prime.

It is a super-2 number, since 2×78138585613² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78138585617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1033695 + ... + 1106707.

It is an arithmetic number, because the mean of its divisors is an integer number (2897925660).

Almost surely, 2^78138585613 is an apocalyptic number.

It is an amenable number.

78138585613 is a deficient number, since it is larger than the sum of its proper divisors (14595035507).

78138585613 is a wasteful number, since it uses less digits than its factorization.

78138585613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73197.

The product of its digits is 4838400, while the sum is 55.

The spelling of 78138585613 in words is "seventy-eight billion, one hundred thirty-eight million, five hundred eighty-five thousand, six hundred thirteen".