15751249920 has 612 divisors, whose sum is σ = 64101583260. Its totient is φ = 3567255552.

The previous prime is 15751249867. The next prime is 15751249951. The reversal of 15751249920 is 2994215751.

15751249920 is a `hidden beast` number, since 1 + 5 + 7 + 512 + 49 + 92 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8352497664 + 7398752256 = 91392^2 + 86016^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 144506826 + ... + 144506934.

Almost surely, 2^15751249920 is an apocalyptic number.

15751249920 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 15751249920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32050791630).

15751249920 is an abundant number, since it is smaller than the sum of its proper divisors (48350333340).

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

15751249920 is an equidigital number, since it uses as much as digits as its factorization.

15751249920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 15751249920 in words is "fifteen billion, seven hundred fifty-one million, two hundred forty-nine thousand, nine hundred twenty".