77685977958677 has 4 divisors (see below), whose sum is σ = 84748339591296. Its totient is φ = 70623616326060.

The previous prime is 77685977958649. The next prime is 77685977958769.

77685977958677 is nontrivially palindromic in base 10.

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 77685977958677 - 2²⁴ = 77685961181461 is a prime.

It is a super-2 number, since 2×77685977958677² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77685977958577) 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, 3531180816293 + ... + 3531180816314.

It is an arithmetic number, because the mean of its divisors is an integer number (21187084897824).

Almost surely, 2^{77685977958677} is an apocalyptic number.

It is an amenable number.

77685977958677 is a deficient number, since it is larger than the sum of its proper divisors (7062361632619).

77685977958677 is a wasteful number, since it uses less digits than its factorization.

77685977958677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062361632618.

The product of its digits is 548903174400, while the sum is 98.

The spelling of 77685977958677 in words is "seventy-seven trillion, six hundred eighty-five billion, nine hundred seventy-seven million, nine hundred fifty-eight thousand, six hundred seventy-seven".