78925051815 has 16 divisors (see below), whose sum is σ = 127698962400. Its totient is φ = 41620401152.

The previous prime is 78925051801. The next prime is 78925051823. The reversal of 78925051815 is 51815052987.

It is a cyclic number.

It is not a de Polignac number, because 78925051815 - 2¹⁹ = 78924527527 is a prime.

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, 29558610 + ... + 29561279.

It is an arithmetic number, because the mean of its divisors is an integer number (7981185150).

Almost surely, 2^78925051815 is an apocalyptic number.

78925051815 is a deficient number, since it is larger than the sum of its proper divisors (48773910585).

78925051815 is a wasteful number, since it uses less digits than its factorization.

78925051815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59119986.

The product of its (nonzero) digits is 1008000, while the sum is 51.

The spelling of 78925051815 in words is "seventy-eight billion, nine hundred twenty-five million, fifty-one thousand, eight hundred fifteen".