79990840418 has 16 divisors (see below), whose sum is σ = 131425114680. Its totient is φ = 36344722176.

The previous prime is 79990840381. The next prime is 79990840529. The reversal of 79990840418 is 81404809997.

It can be written as a sum of positive squares in 4 ways, for example, as 79887065449 + 103774969 = 282643^2 + 10187^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40562321 + ... + 40564292.

Almost surely, 2^79990840418 is an apocalyptic number.

79990840418 is a deficient number, since it is larger than the sum of its proper divisors (51434274262).

79990840418 is a wasteful number, since it uses less digits than its factorization.

79990840418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81126661.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The spelling of 79990840418 in words is "seventy-nine billion, nine hundred ninety million, eight hundred forty thousand, four hundred eighteen".