9977656945679 has 4 divisors (see below), whose sum is σ = 9977864649600. Its totient is φ = 9977449241760.

The previous prime is 9977656945657. The next prime is 9977656945687. The reversal of 9977656945679 is 9765496567799.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9977656945679 - 2³² = 9973361978383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9977656945594 and 9977656945603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9977656944679) 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, 103779887 + ... + 103875984.

It is an arithmetic number, because the mean of its divisors is an integer number (2494466162400).

Almost surely, 2^{9977656945679} is an apocalyptic number.

9977656945679 is a deficient number, since it is larger than the sum of its proper divisors (207703921).

9977656945679 is a wasteful number, since it uses less digits than its factorization.

9977656945679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207703920.

The product of its digits is 48609136800, while the sum is 89.

The spelling of 9977656945679 in words is "nine trillion, nine hundred seventy-seven billion, six hundred fifty-six million, nine hundred forty-five thousand, six hundred seventy-nine".