988664977021 has 16 divisors (see below), whose sum is σ = 1022217509376. Its totient is φ = 955707831936.

The previous prime is 988664977019. The next prime is 988664977033. The reversal of 988664977021 is 120779466889.

988664977021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 988664977021 - 2¹ = 988664977019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988664977051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 831145 + ... + 1633441.

It is an arithmetic number, because the mean of its divisors is an integer number (63888594336).

Almost surely, 2^988664977021 is an apocalyptic number.

It is an amenable number.

988664977021 is a deficient number, since it is larger than the sum of its proper divisors (33552532355).

988664977021 is a wasteful number, since it uses less digits than its factorization.

988664977021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802668.

The product of its (nonzero) digits is 73156608, while the sum is 67.

The spelling of 988664977021 in words is "nine hundred eighty-eight billion, six hundred sixty-four million, nine hundred seventy-seven thousand, twenty-one".