15981821549152 has 24 divisors (see below), whose sum is σ = 31464716145912. Its totient is φ = 7990782528000.

The previous prime is 15981821549137. The next prime is 15981821549257. The reversal of 15981821549152 is 25194512818951.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966674 + ... + 5985937.

It is an arithmetic number, because the mean of its divisors is an integer number (1311029839413).

Almost surely, 2^{15981821549152} is an apocalyptic number.

It is an amenable number.

15981821549152 is a deficient number, since it is larger than the sum of its proper divisors (15482894596760).

15981821549152 is an equidigital number, since it uses as much as digits as its factorization.

15981821549152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8015422 (or 8015414 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 61.

The spelling of 15981821549152 in words is "fifteen trillion, nine hundred eighty-one billion, eight hundred twenty-one million, five hundred forty-nine thousand, one hundred fifty-two".