15661658442 has 96 divisors (see below), whose sum is σ = 34682437440. Its totient is φ = 4697164800.

The previous prime is 15661658437. The next prime is 15661658443. The reversal of 15661658442 is 24485616651.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 15661658391 and 15661658400.

It is not an unprimeable number, because it can be changed into a prime (15661658443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8237692 + ... + 8239592.

It is an arithmetic number, because the mean of its divisors is an integer number (361275390).

Almost surely, 2^15661658442 is an apocalyptic number.

15661658442 is an abundant number, since it is smaller than the sum of its proper divisors (19020778998).

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

15661658442 is a wasteful number, since it uses less digits than its factorization.

15661658442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2019 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The spelling of 15661658442 in words is "fifteen billion, six hundred sixty-one million, six hundred fifty-eight thousand, four hundred forty-two".