79517668897778 has 32 divisors (see below), whose sum is σ = 125457639816960. Its totient is φ = 37747592023680.

The previous prime is 79517668897727. The next prime is 79517668897883. The reversal of 79517668897778 is 87779886671597.

It is a Curzon 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, 26968250 + ... + 29771157.

It is an arithmetic number, because the mean of its divisors is an integer number (3920551244280).

Almost surely, 2^{79517668897778} is an apocalyptic number.

79517668897778 is a deficient number, since it is larger than the sum of its proper divisors (45939970919182).

79517668897778 is a wasteful number, since it uses less digits than its factorization.

79517668897778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56739842.

The product of its digits is 125463582720, while the sum is 95.

The spelling of 79517668897778 in words is "seventy-nine trillion, five hundred seventeen billion, six hundred sixty-eight million, eight hundred ninety-seven thousand, seven hundred seventy-eight".