997909958208 has 56 divisors (see below), whose sum is σ = 2641984881120. Its totient is φ = 332424816640.

The previous prime is 997909958191. The next prime is 997909958219. The reversal of 997909958208 is 802859909799.

It is a self number, because there is not a number n which added to its sum of digits gives 997909958208.

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, 1352553 + ... + 1955816.

Almost surely, 2^997909958208 is an apocalyptic number.

It is an amenable number.

997909958208 is an abundant number, since it is smaller than the sum of its proper divisors (1644074922912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997909958208 is a wasteful number, since it uses less digits than its factorization.

997909958208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309955 (or 3309945 counting only the distinct ones).

The product of its (nonzero) digits is 264539520, while the sum is 75.

The spelling of 997909958208 in words is "nine hundred ninety-seven billion, nine hundred nine million, nine hundred fifty-eight thousand, two hundred eight".