15499974672 has 560 divisors, whose sum is σ = 58744990080. Its totient is φ = 3842961408.

The previous prime is 15499974671. The next prime is 15499974731. The reversal of 15499974672 is 27647999451.

15499974672 is a `hidden beast` number, since 1 + 5 + 499 + 9 + 74 + 6 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (15499974671) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 18043779 + ... + 18044637.

It is an arithmetic number, because the mean of its divisors is an integer number (104901768).

Almost surely, 2^15499974672 is an apocalyptic number.

15499974672 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 15499974672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29372495040).

15499974672 is an abundant number, since it is smaller than the sum of its proper divisors (43245015408).

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

15499974672 is a wasteful number, since it uses less digits than its factorization.

15499974672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 901 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 15499974672 in words is "fifteen billion, four hundred ninety-nine million, nine hundred seventy-four thousand, six hundred seventy-two".