15661155942 has 12 divisors (see below), whose sum is σ = 33932504580. Its totient is φ = 5220385308.

The previous prime is 15661155941. The next prime is 15661155943. The reversal of 15661155942 is 24955116651.

15661155942 is a `hidden beast` number, since 1 + 56 + 6 + 1 + 1 + 5 + 594 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (15661155941) and next prime (15661155943).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661155941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 435032092 + ... + 435032127.

It is an arithmetic number, because the mean of its divisors is an integer number (2827708715).

Almost surely, 2^15661155942 is an apocalyptic number.

15661155942 is an abundant number, since it is smaller than the sum of its proper divisors (18271348638).

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

15661155942 is a wasteful number, since it uses less digits than its factorization.

15661155942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870064227 (or 870064224 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The spelling of 15661155942 in words is "fifteen billion, six hundred sixty-one million, one hundred fifty-five thousand, nine hundred forty-two".