78113531051 has 4 divisors (see below), whose sum is σ = 78137547072. Its totient is φ = 78089515032.

The previous prime is 78113531033. The next prime is 78113531053. The reversal of 78113531051 is 15013531187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78113531051 is a prime.

It is a super-2 number, since 2×78113531051² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78113531053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12003131 + ... + 12009636.

It is an arithmetic number, because the mean of its divisors is an integer number (19534386768).

Almost surely, 2^78113531051 is an apocalyptic number.

78113531051 is a deficient number, since it is larger than the sum of its proper divisors (24016021).

78113531051 is a wasteful number, since it uses less digits than its factorization.

78113531051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24016020.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 78113531051 in words is "seventy-eight billion, one hundred thirteen million, five hundred thirty-one thousand, fifty-one".