15561195382440 has 384 divisors, whose sum is σ = 54831166790400. Its totient is φ = 3969202279680.

The previous prime is 15561195382427. The next prime is 15561195382459. The reversal of 15561195382440 is 4428359116551.

15561195382440 is a `hidden beast` number, since 1 + 5 + 5 + 6 + 1 + 195 + 3 + 8 + 2 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 95 ways as a sum of consecutive naturals, for example, 118197450 + ... + 118329030.

It is an arithmetic number, because the mean of its divisors is an integer number (142789496850).

Almost surely, 2^{15561195382440} is an apocalyptic number.

15561195382440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15561195382440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27415583395200).

15561195382440 is an abundant number, since it is smaller than the sum of its proper divisors (39269971407960).

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

15561195382440 is an equidigital number, since it uses as much as digits as its factorization.

15561195382440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131676 (or 131614 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 54.

The spelling of 15561195382440 in words is "fifteen trillion, five hundred sixty-one billion, one hundred ninety-five million, three hundred eighty-two thousand, four hundred forty".