15555251320 has 128 divisors (see below), whose sum is σ = 40740249600. Its totient is φ = 5234803200.

The previous prime is 15555251291. The next prime is 15555251321. The reversal of 15555251320 is 2315255551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15555251321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15696025 + ... + 15697015.

It is an arithmetic number, because the mean of its divisors is an integer number (318283200).

Almost surely, 2^15555251320 is an apocalyptic number.

15555251320 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 15555251320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20370124800).

15555251320 is an abundant number, since it is smaller than the sum of its proper divisors (25184998280).

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

15555251320 is a wasteful number, since it uses less digits than its factorization.

15555251320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989 (or 1985 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 15555251320 in words is "fifteen billion, five hundred fifty-five million, two hundred fifty-one thousand, three hundred twenty".