15504221952 has 324 divisors, whose sum is σ = 49295098944. Its totient is φ = 4665507840.

The previous prime is 15504221951. The next prime is 15504221959. The reversal of 15504221952 is 25912240551.

15504221952 is a `hidden beast` number, since 1 + 550 + 42 + 2 + 19 + 52 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15504221951) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 137205448 + ... + 137205560.

Almost surely, 2^15504221952 is an apocalyptic number.

15504221952 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 15504221952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24647549472).

15504221952 is an abundant number, since it is smaller than the sum of its proper divisors (33790876992).

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

15504221952 is a wasteful number, since it uses less digits than its factorization.

15504221952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 15504221952 in words is "fifteen billion, five hundred four million, two hundred twenty-one thousand, nine hundred fifty-two".