77979072491776 has 27 divisors (see below), whose sum is σ = 155653821258663. Its totient is φ = 38989465601280.

The previous prime is 77979072491773. The next prime is 77979072491779. The reversal of 77979072491776 is 67719427097977.

The square root of 77979072491776 is 8830576.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (77979072491773) and next prime (77979072491779).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77979072491776.

It is not an unprimeable number, because it can be changed into a prime (77979072491773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 141013261 + ... + 141565171.

Almost surely, 2^{77979072491776} is an apocalyptic number.

77979072491776 is the 8830576-th square number.

It is an amenable number.

77979072491776 is a deficient number, since it is larger than the sum of its proper divisors (77674748766887).

77979072491776 is an frugal number, since it uses more digits than its factorization.

77979072491776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103838 (or 551913 counting only the distinct ones).

The product of its (nonzero) digits is 4116773808, while the sum is 82.

The spelling of 77979072491776 in words is "seventy-seven trillion, nine hundred seventy-nine billion, seventy-two million, four hundred ninety-one thousand, seven hundred seventy-six".