989937181664 has 48 divisors (see below), whose sum is σ = 1957537834560. Its totient is φ = 492785664000.

The previous prime is 989937181591. The next prime is 989937181777. The reversal of 989937181664 is 466181739989.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41233664 + ... + 41257664.

It is an arithmetic number, because the mean of its divisors is an integer number (40782038220).

Almost surely, 2^989937181664 is an apocalyptic number.

It is an amenable number.

989937181664 is a deficient number, since it is larger than the sum of its proper divisors (967600652896).

989937181664 is a wasteful number, since it uses less digits than its factorization.

989937181664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29643 (or 29635 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 71.

The spelling of 989937181664 in words is "nine hundred eighty-nine billion, nine hundred thirty-seven million, one hundred eighty-one thousand, six hundred sixty-four".