77958085977 has 48 divisors (see below), whose sum is σ = 121576885248. Its totient is φ = 47995960320.

The previous prime is 77958085973. The next prime is 77958085987.

It is a happy number.

77958085977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 77958085977 - 2² = 77958085973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77958085973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2764533 + ... + 2792589.

It is an arithmetic number, because the mean of its divisors is an integer number (2532851776).

Almost surely, 2^77958085977 is an apocalyptic number.

It is an amenable number.

77958085977 is a deficient number, since it is larger than the sum of its proper divisors (43618799271).

77958085977 is a wasteful number, since it uses less digits than its factorization.

77958085977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28550 (or 28547 counting only the distinct ones).

The product of its (nonzero) digits is 311169600, while the sum is 72.

The spelling of 77958085977 in words is "seventy-seven billion, nine hundred fifty-eight million, eighty-five thousand, nine hundred seventy-seven".