78815022005 has 16 divisors (see below), whose sum is σ = 101266634160. Its totient is φ = 58676293632.

The previous prime is 78815021977. The next prime is 78815022079. The reversal of 78815022005 is 50022051887.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1222691089 + 77592330916 = 34967^2 + 278554^2 .

It is a cyclic number.

It is not a de Polignac number, because 78815022005 - 2¹² = 78815017909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78815022005.

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, 5201624 + ... + 5216753.

It is an arithmetic number, because the mean of its divisors is an integer number (6329164635).

Almost surely, 2^78815022005 is an apocalyptic number.

It is an amenable number.

78815022005 is a deficient number, since it is larger than the sum of its proper divisors (22451612155).

78815022005 is a wasteful number, since it uses less digits than its factorization.

78815022005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418488.

The product of its (nonzero) digits is 44800, while the sum is 38.

The spelling of 78815022005 in words is "seventy-eight billion, eight hundred fifteen million, twenty-two thousand, five".