15961932400 has 90 divisors (see below), whose sum is σ = 40737328160. Its totient is φ = 6009154560.

The previous prime is 15961932391. The next prime is 15961932439. The reversal of 15961932400 is 423916951.

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 (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46561 + ... + 184639.

Almost surely, 2^15961932400 is an apocalyptic number.

15961932400 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 15961932400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20368664080).

15961932400 is an abundant number, since it is smaller than the sum of its proper divisors (24775395760).

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

15961932400 is a wasteful number, since it uses less digits than its factorization.

15961932400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138131 (or 138103 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 15961932400 in words is "fifteen billion, nine hundred sixty-one million, nine hundred thirty-two thousand, four hundred".