15721452620 has 12 divisors (see below), whose sum is σ = 33015050544. Its totient is φ = 6288581040.

The previous prime is 15721452599. The next prime is 15721452667. The reversal of 15721452620 is 2625412751.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393036296 + ... + 393036335.

It is an arithmetic number, because the mean of its divisors is an integer number (2751254212).

Almost surely, 2^15721452620 is an apocalyptic number.

15721452620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15721452620 is an abundant number, since it is smaller than the sum of its proper divisors (17293597924).

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

15721452620 is a wasteful number, since it uses less digits than its factorization.

15721452620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786072640 (or 786072638 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 15721452620 in words is "fifteen billion, seven hundred twenty-one million, four hundred fifty-two thousand, six hundred twenty".