15811860960 has 480 divisors, whose sum is σ = 65094321600. Its totient is φ = 3613123584.

The previous prime is 15811860943. The next prime is 15811860983. The reversal of 15811860960 is 6906811851.

15811860960 is a `hidden beast` number, since 1 + 581 + 1 + 8 + 6 + 0 + 9 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4443502 + ... + 4447058.

It is an arithmetic number, because the mean of its divisors is an integer number (135613170).

Almost surely, 2^15811860960 is an apocalyptic number.

15811860960 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 15811860960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32547160800).

15811860960 is an abundant number, since it is smaller than the sum of its proper divisors (49282460640).

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

15811860960 is an equidigital number, since it uses as much as digits as its factorization.

15811860960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605 (or 3574 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 15811860960 in words is "fifteen billion, eight hundred eleven million, eight hundred sixty thousand, nine hundred sixty".