15961959520 has 384 divisors, whose sum is σ = 44869386240. Its totient is φ = 5316157440.

The previous prime is 15961959479. The next prime is 15961959547. The reversal of 15961959520 is 2595916951.

It is a Smith number, since the sum of its digits (52) 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 (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69702766 + ... + 69702994.

It is an arithmetic number, because the mean of its divisors is an integer number (116847360).

Almost surely, 2^15961959520 is an apocalyptic number.

15961959520 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 15961959520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22434693120).

15961959520 is an abundant number, since it is smaller than the sum of its proper divisors (28907426720).

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

15961959520 is a wasteful number, since it uses less digits than its factorization.

15961959520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 1093500, while the sum is 52.

The spelling of 15961959520 in words is "fifteen billion, nine hundred sixty-one million, nine hundred fifty-nine thousand, five hundred twenty".