15899940680 has 128 divisors (see below), whose sum is σ = 39304742400. Its totient is φ = 5752857600.

The previous prime is 15899940653. The next prime is 15899940689. The reversal of 15899940680 is 8604999851.

It is a super-2 number, since 2×15899940680² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (15899940689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12915665 + ... + 12916895.

It is an arithmetic number, because the mean of its divisors is an integer number (307068300).

Almost surely, 2^15899940680 is an apocalyptic number.

15899940680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15899940680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19652371200).

15899940680 is an abundant number, since it is smaller than the sum of its proper divisors (23404801720).

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

15899940680 is a wasteful number, since it uses less digits than its factorization.

15899940680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 59.

The spelling of 15899940680 in words is "fifteen billion, eight hundred ninety-nine million, nine hundred forty thousand, six hundred eighty".