16401658868 has 18 divisors (see below), whose sum is σ = 33389091666. Its totient is φ = 7029282288.

The previous prime is 16401658813. The next prime is 16401658909. The reversal of 16401658868 is 86885610461.

It can be written as a sum of positive squares in only one way, i.e., 13955169424 + 2446489444 = 118132^2 + 49462^2 .

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, 41840771 + ... + 41841162.

It is an arithmetic number, because the mean of its divisors is an integer number (1854949537).

Almost surely, 2^16401658868 is an apocalyptic number.

It is an amenable number.

16401658868 is an abundant number, since it is smaller than the sum of its proper divisors (16987432798).

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

16401658868 is a wasteful number, since it uses less digits than its factorization.

16401658868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83681951 (or 83681942 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 16401658868 in words is "sixteen billion, four hundred one million, six hundred fifty-eight thousand, eight hundred sixty-eight".