977355665638 has 12 divisors (see below), whose sum is σ = 1599316858908. Its totient is φ = 444250467560.

The previous prime is 977355665599. The next prime is 977355665717. The reversal of 977355665638 is 836566553779.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4531620 + ... + 4742392.

It is an arithmetic number, because the mean of its divisors is an integer number (133276404909).

Almost surely, 2^977355665638 is an apocalyptic number.

977355665638 is a deficient number, since it is larger than the sum of its proper divisors (621961193270).

977355665638 is an frugal number, since it uses more digits than its factorization.

977355665638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421559 (or 210786 counting only the distinct ones).

The product of its digits is 857304000, while the sum is 70.

The spelling of 977355665638 in words is "nine hundred seventy-seven billion, three hundred fifty-five million, six hundred sixty-five thousand, six hundred thirty-eight".