16261537320 has 640 divisors, whose sum is σ = 65402726400. Its totient is φ = 3545856000.

The previous prime is 16261537297. The next prime is 16261537337. The reversal of 16261537320 is 2373516261.

16261537320 is a `hidden beast` number, since 1 + 6 + 2 + 615 + 3 + 7 + 32 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 71010966 + ... + 71011194.

It is an arithmetic number, because the mean of its divisors is an integer number (102191760).

Almost surely, 2^16261537320 is an apocalyptic number.

16261537320 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 16261537320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32701363200).

16261537320 is an abundant number, since it is smaller than the sum of its proper divisors (49141189080).

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

16261537320 is a wasteful number, since it uses less digits than its factorization.

16261537320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 16261537320 in words is "sixteen billion, two hundred sixty-one million, five hundred thirty-seven thousand, three hundred twenty".