79653634978 has 16 divisors (see below), whose sum is σ = 120589232760. Its totient is φ = 39458367616.

The previous prime is 79653634961. The next prime is 79653634979. The reversal of 79653634978 is 87943635697.

It can be written as a sum of positive squares in 4 ways, for example, as 66906547569 + 12747087409 = 258663^2 + 112903^2 .

It is not an unprimeable number, because it can be changed into a prime (79653634979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146101 + ... + 425032.

Almost surely, 2^79653634978 is an apocalyptic number.

79653634978 is a deficient number, since it is larger than the sum of its proper divisors (40935597782).

79653634978 is a wasteful number, since it uses less digits than its factorization.

79653634978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571781.

The product of its digits is 205752960, while the sum is 67.

The spelling of 79653634978 in words is "seventy-nine billion, six hundred fifty-three million, six hundred thirty-four thousand, nine hundred seventy-eight".