15665542242 has 16 divisors (see below), whose sum is σ = 35806953792. Its totient is φ = 4475869200.

The previous prime is 15665542231. The next prime is 15665542247. The reversal of 15665542242 is 24224556651.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 372989101 = 15665542242 / (1 + 5 + 6 + 6 + 5 + 5 + 4 + 2 + 2 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 15665542194 and 15665542203.

It is not an unprimeable number, because it can be changed into a prime (15665542247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186494509 + ... + 186494592.

It is an arithmetic number, because the mean of its divisors is an integer number (2237934612).

Almost surely, 2^15665542242 is an apocalyptic number.

15665542242 is an abundant number, since it is smaller than the sum of its proper divisors (20141411550).

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

15665542242 is a wasteful number, since it uses less digits than its factorization.

15665542242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372989113.

The product of its digits is 576000, while the sum is 42.

The spelling of 15665542242 in words is "fifteen billion, six hundred sixty-five million, five hundred forty-two thousand, two hundred forty-two".