77656671576644 has 24 divisors (see below), whose sum is σ = 143173925647200. Its totient is φ = 36753326026560.

The previous prime is 77656671576613. The next prime is 77656671576667. The reversal of 77656671576644 is 44667517665677.

It is a Smith number, since the sum of its digits (77) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436204049 + ... + 436382040.

It is an arithmetic number, because the mean of its divisors is an integer number (5965580235300).

Almost surely, 2^{77656671576644} is an apocalyptic number.

It is an amenable number.

77656671576644 is a deficient number, since it is larger than the sum of its proper divisors (65517254070556).

77656671576644 is a wasteful number, since it uses less digits than its factorization.

77656671576644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872587283 (or 872587281 counting only the distinct ones).

The product of its digits is 7468070400, while the sum is 77.

The spelling of 77656671576644 in words is "seventy-seven trillion, six hundred fifty-six billion, six hundred seventy-one million, five hundred seventy-six thousand, six hundred forty-four".