77172428474961 has 4 divisors (see below), whose sum is σ = 102896571299952. Its totient is φ = 51448285649972.

The previous prime is 77172428474929. The next prime is 77172428474971. The reversal of 77172428474961 is 16947482427177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77172428474961 - 2⁵ = 77172428474929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77172428474971) 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, 12862071412491 + ... + 12862071412496.

It is an arithmetic number, because the mean of its divisors is an integer number (25724142824988).

Almost surely, 2^{77172428474961} is an apocalyptic number.

It is an amenable number.

77172428474961 is a deficient number, since it is larger than the sum of its proper divisors (25724142824991).

77172428474961 is a wasteful number, since it uses less digits than its factorization.

77172428474961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25724142824990.

The product of its digits is 265531392, while the sum is 69.

The spelling of 77172428474961 in words is "seventy-seven trillion, one hundred seventy-two billion, four hundred twenty-eight million, four hundred seventy-four thousand, nine hundred sixty-one".