15451539642 has 128 divisors (see below), whose sum is σ = 42940385280. Its totient is φ = 4001114880.

The previous prime is 15451539637. The next prime is 15451539659. The reversal of 15451539642 is 24693515451.

It is a happy number.

15451539642 is a `hidden beast` number, since 1 + 5 + 4 + 51 + 539 + 64 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1395733 + ... + 1406759.

It is an arithmetic number, because the mean of its divisors is an integer number (335471760).

Almost surely, 2^15451539642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15451539642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21470192640).

15451539642 is an abundant number, since it is smaller than the sum of its proper divisors (27488845638).

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

15451539642 is a wasteful number, since it uses less digits than its factorization.

15451539642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11393 (or 11387 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 15451539642 in words is "fifteen billion, four hundred fifty-one million, five hundred thirty-nine thousand, six hundred forty-two".