15991137400 has 48 divisors (see below), whose sum is σ = 42490740240. Its totient is φ = 5482675200.

The previous prime is 15991137367. The next prime is 15991137469. The reversal of 15991137400 is 473119951.

15991137400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5709721 + ... + 5712520.

It is an arithmetic number, because the mean of its divisors is an integer number (885223755).

Almost surely, 2^15991137400 is an apocalyptic number.

15991137400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15991137400 is an abundant number, since it is smaller than the sum of its proper divisors (26499602840).

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

15991137400 is a wasteful number, since it uses less digits than its factorization.

15991137400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11422264 (or 11422255 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 40.

The spelling of 15991137400 in words is "fifteen billion, nine hundred ninety-one million, one hundred thirty-seven thousand, four hundred".