15999999999894 has 48 divisors (see below), whose sum is σ = 36811057046400. Its totient is φ = 5005224979200.

The previous prime is 15999999999881. The next prime is 15999999999901. The reversal of 15999999999894 is 49899999999951.

It is a super-2 number, since 2×15999999999894² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74803782 + ... + 75017369.

It is an arithmetic number, because the mean of its divisors is an integer number (766897021800).

Almost surely, 2^{15999999999894} is an apocalyptic number.

15999999999894 is an abundant number, since it is smaller than the sum of its proper divisors (20811057046506).

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

15999999999894 is a wasteful number, since it uses less digits than its factorization.

15999999999894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149821525 (or 149821522 counting only the distinct ones).

The product of its digits is 557885504160, while the sum is 108.

The spelling of 15999999999894 in words is "fifteen trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-four".