15621322540 has 48 divisors (see below), whose sum is σ = 33325891200. Its totient is φ = 6149774592.

The previous prime is 15621322529. The next prime is 15621322543. The reversal of 15621322540 is 4522312651.

It is not an unprimeable number, because it can be changed into a prime (15621322543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485266 + ... + 516454.

It is an arithmetic number, because the mean of its divisors is an integer number (694289400).

Almost surely, 2^15621322540 is an apocalyptic number.

15621322540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15621322540 is an abundant number, since it is smaller than the sum of its proper divisors (17704568660).

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

15621322540 is a wasteful number, since it uses less digits than its factorization.

15621322540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31594 (or 31592 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 15621322540 in words is "fifteen billion, six hundred twenty-one million, three hundred twenty-two thousand, five hundred forty".