79661319005840 has 160 divisors (see below), whose sum is σ = 230391938722176. Its totient is φ = 25166554030080.

The previous prime is 79661319005809. The next prime is 79661319005887. The reversal of 79661319005840 is 4850091316697.

It is a self number, because there is not a number n which added to its sum of digits gives 79661319005840.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204611462 + ... + 205000421.

Almost surely, 2^{79661319005840} is an apocalyptic number.

It is an amenable number.

79661319005840 is an abundant number, since it is smaller than the sum of its proper divisors (150730619716336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79661319005840 is a wasteful number, since it uses less digits than its factorization.

79661319005840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409611937 (or 409611931 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 79661319005840 in words is "seventy-nine trillion, six hundred sixty-one billion, three hundred nineteen million, five thousand, eight hundred forty".