15723122472 has 96 divisors (see below), whose sum is σ = 44801363880. Its totient is φ = 4974981120.

The previous prime is 15723122449. The next prime is 15723122491. The reversal of 15723122472 is 27422132751.

15723122472 is a `hidden beast` number, since 1 + 572 + 3 + 12 + 2 + 4 + 72 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8207272836 + 7515849636 = 90594^2 + 86694^2 .

It is a super-2 number, since 2×15723122472² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37248 + ... + 181200.

Almost surely, 2^15723122472 is an apocalyptic number.

15723122472 is a gapful number since it is divisible by the number (12) 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 15723122472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22400681940).

15723122472 is an abundant number, since it is smaller than the sum of its proper divisors (29078241408).

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

15723122472 is a wasteful number, since it uses less digits than its factorization.

15723122472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144043 (or 144036 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The spelling of 15723122472 in words is "fifteen billion, seven hundred twenty-three million, one hundred twenty-two thousand, four hundred seventy-two".