15557113412720 has 80 divisors (see below), whose sum is σ = 39999024264672. Its totient is φ = 5579637166080.

The previous prime is 15557113412719. The next prime is 15557113412741. The reversal of 15557113412720 is 2721431175551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121021637 + ... + 121150116.

Almost surely, 2^{15557113412720} is an apocalyptic number.

15557113412720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15557113412720 is an abundant number, since it is smaller than the sum of its proper divisors (24441910851952).

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

15557113412720 is a wasteful number, since it uses less digits than its factorization.

15557113412720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242171850 (or 242171844 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 44.

The spelling of 15557113412720 in words is "fifteen trillion, five hundred fifty-seven billion, one hundred thirteen million, four hundred twelve thousand, seven hundred twenty".