15845522642 has 16 divisors (see below), whose sum is σ = 24681541752. Its totient is φ = 7623636480.

The previous prime is 15845522597. The next prime is 15845522717. The reversal of 15845522642 is 24622554851.

It is a Cunningham number, because it is equal to 125879²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 8994815281 + 6850707361 = 94841^2 + 82769^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15845522593 and 15845522602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1317563 + ... + 1329534.

Almost surely, 2^15845522642 is an apocalyptic number.

15845522642 is a deficient number, since it is larger than the sum of its proper divisors (8836019110).

15845522642 is a wasteful number, since it uses less digits than its factorization.

15845522642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2647213.

The product of its digits is 768000, while the sum is 44.

The spelling of 15845522642 in words is "fifteen billion, eight hundred forty-five million, five hundred twenty-two thousand, six hundred forty-two".