15561215116400 has 60 divisors (see below), whose sum is σ = 37388997076032. Its totient is φ = 6223956971520.

The previous prime is 15561215116397. The next prime is 15561215116409. The reversal of 15561215116400 is 461151216551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561215116409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3075344 + ... + 6370256.

Almost surely, 2^{15561215116400} is an apocalyptic number.

15561215116400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15561215116400 is an abundant number, since it is smaller than the sum of its proper divisors (21827781959632).

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

15561215116400 is a wasteful number, since it uses less digits than its factorization.

15561215116400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306738 (or 3306727 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 38.

The spelling of 15561215116400 in words is "fifteen trillion, five hundred sixty-one billion, two hundred fifteen million, one hundred sixteen thousand, four hundred".