78475577815 has 16 divisors (see below), whose sum is σ = 96587157888. Its totient is φ = 61180953856.

The previous prime is 78475577783. The next prime is 78475577821. The reversal of 78475577815 is 51877557487.

It is a cyclic number.

It is not a de Polignac number, because 78475577815 - 2⁵ = 78475577783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661852 + ... + 771361.

It is an arithmetic number, because the mean of its divisors is an integer number (6036697368).

Almost surely, 2^78475577815 is an apocalyptic number.

78475577815 is a deficient number, since it is larger than the sum of its proper divisors (18111580073).

78475577815 is a wasteful number, since it uses less digits than its factorization.

78475577815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433498.

The product of its digits is 76832000, while the sum is 64.

The spelling of 78475577815 in words is "seventy-eight billion, four hundred seventy-five million, five hundred seventy-seven thousand, eight hundred fifteen".