15421995264 has 144 divisors (see below), whose sum is σ = 46802956032. Its totient is φ = 4466049024.

The previous prime is 15421995263. The next prime is 15421995283. The reversal of 15421995264 is 46259912451.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (15421995263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124297 + ... + 215159.

It is an arithmetic number, because the mean of its divisors is an integer number (325020528).

Almost surely, 2^15421995264 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 15421995264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23401478016).

15421995264 is an abundant number, since it is smaller than the sum of its proper divisors (31380960768).

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

15421995264 is a wasteful number, since it uses less digits than its factorization.

15421995264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90912 (or 90898 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The spelling of 15421995264 in words is "fifteen billion, four hundred twenty-one million, nine hundred ninety-five thousand, two hundred sixty-four".