76991177797 has 4 divisors (see below), whose sum is σ = 76992204940. Its totient is φ = 76990150656.

The previous prime is 76991177773. The next prime is 76991177831. The reversal of 76991177797 is 79777119967.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79777119967 = 10069 ⋅7923043.

It can be written as a sum of positive squares in 2 ways, for example, as 8624093956 + 68367083841 = 92866^2 + 261471^2 .

It is a cyclic number.

It is not a de Polignac number, because 76991177797 - 2¹¹ = 76991175749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76991177897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391458 + ... + 554275.

It is an arithmetic number, because the mean of its divisors is an integer number (19248051235).

Almost surely, 2^76991177797 is an apocalyptic number.

It is an amenable number.

76991177797 is a deficient number, since it is larger than the sum of its proper divisors (1027143).

76991177797 is an equidigital number, since it uses as much as digits as its factorization.

76991177797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027142.

The product of its digits is 73513818, while the sum is 70.

The spelling of 76991177797 in words is "seventy-six billion, nine hundred ninety-one million, one hundred seventy-seven thousand, seven hundred ninety-seven".