77990345179 has 32 divisors (see below), whose sum is σ = 85004849664. Its totient is φ = 71355271680.

The previous prime is 77990345131. The next prime is 77990345203. The reversal of 77990345179 is 97154309977.

It is a cyclic number.

It is not a de Polignac number, because 77990345179 - 2⁷ = 77990345051 is a prime.

It is a super-2 number, since 2×77990345179² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77990349179) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14900947 + ... + 14906179.

It is an arithmetic number, because the mean of its divisors is an integer number (2656401552).

Almost surely, 2^77990345179 is an apocalyptic number.

77990345179 is a deficient number, since it is larger than the sum of its proper divisors (7014504485).

77990345179 is a wasteful number, since it uses less digits than its factorization.

77990345179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5587.

The product of its (nonzero) digits is 15002820, while the sum is 61.

The spelling of 77990345179 in words is "seventy-seven billion, nine hundred ninety million, three hundred forty-five thousand, one hundred seventy-nine".