77955566555977 has 16 divisors (see below), whose sum is σ = 85066637350464. Its totient is φ = 70848532152000.

The previous prime is 77955566555957. The next prime is 77955566556017.

77955566555977 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 77955566555977 - 2²³ = 77955558167369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77955566555957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607317118 + ... + 607445464.

It is an arithmetic number, because the mean of its divisors is an integer number (5316664834404).

Almost surely, 2^{77955566555977} is an apocalyptic number.

It is an amenable number.

77955566555977 is a deficient number, since it is larger than the sum of its proper divisors (7111070794487).

77955566555977 is a wasteful number, since it uses less digits than its factorization.

77955566555977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143640.

The product of its digits is 109395562500, while the sum is 88.

The spelling of 77955566555977 in words is "seventy-seven trillion, nine hundred fifty-five billion, five hundred sixty-six million, five hundred fifty-five thousand, nine hundred seventy-seven".