15999999999893 has 16 divisors (see below), whose sum is σ = 19692401675520. Its totient is φ = 12659280241536.

The previous prime is 15999999999881. The next prime is 15999999999901. The reversal of 15999999999893 is 39899999999951.

It is a cyclic number.

It is not a de Polignac number, because 15999999999893 - 2⁸ = 15999999999637 is a prime.

It is a super-2 number, since 2×15999999999893² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15999989999893) 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, 36635096 + ... + 37069262.

It is an arithmetic number, because the mean of its divisors is an integer number (1230775104720).

Almost surely, 2^{15999999999893} is an apocalyptic number.

15999999999893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

15999999999893 is a deficient number, since it is larger than the sum of its proper divisors (3692401675627).

15999999999893 is a wasteful number, since it uses less digits than its factorization.

15999999999893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839156.

The product of its digits is 418414128120, while the sum is 107.

Adding to 15999999999893 its sum of digits (107), we get a 4-th power (16000000000000 = 2000⁴).

The spelling of 15999999999893 in words is "fifteen trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-three".