15461991504 has 200 divisors, whose sum is σ = 48542471208. Its totient is φ = 4732231680.

The previous prime is 15461991499. The next prime is 15461991541. The reversal of 15461991504 is 40519916451.

15461991504 is a `hidden beast` number, since 1 + 5 + 46 + 19 + 91 + 504 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 214681104 + 15247310400 = 14652^2 + 123480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15461991504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 894754 + ... + 911870.

Almost surely, 2^15461991504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15461991504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24271235604).

15461991504 is an abundant number, since it is smaller than the sum of its proper divisors (33080479704).

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

15461991504 is a wasteful number, since it uses less digits than its factorization.

15461991504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17195 (or 17180 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 15461991504 in words is "fifteen billion, four hundred sixty-one million, nine hundred ninety-one thousand, five hundred four".