15553421434728 has 48 divisors (see below), whose sum is σ = 43482683587200. Its totient is φ = 5017232720160.

The previous prime is 15553421434709. The next prime is 15553421434763. The reversal of 15553421434728 is 82743412435551.

15553421434728 is a `hidden beast` number, since 1 + 5 + 5 + 534 + 2 + 1 + 4 + 34 + 72 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3484187158 + ... + 3484191621.

It is an arithmetic number, because the mean of its divisors is an integer number (905889241400).

Almost surely, 2^{15553421434728} is an apocalyptic number.

15553421434728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

15553421434728 is an abundant number, since it is smaller than the sum of its proper divisors (27929262152472).

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

15553421434728 is a wasteful number, since it uses less digits than its factorization.

15553421434728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6968378822 (or 6968378815 counting only the distinct ones).

The product of its digits is 16128000, while the sum is 54.

The spelling of 15553421434728 in words is "fifteen trillion, five hundred fifty-three billion, four hundred twenty-one million, four hundred thirty-four thousand, seven hundred twenty-eight".