561637690162 has 16 divisors (see below), whose sum is σ = 892547351640. Its totient is φ = 264141704448.

The previous prime is 561637690153. The next prime is 561637690193. The reversal of 561637690162 is 261096736165.

It can be written as a sum of positive squares in 4 ways, for example, as 547098394921 + 14539295241 = 739661^2 + 120579^2 .

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, 4891953 + ... + 5005444.

Almost surely, 2^561637690162 is an apocalyptic number.

561637690162 is a deficient number, since it is larger than the sum of its proper divisors (330909661478).

561637690162 is a wasteful number, since it uses less digits than its factorization.

561637690162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9899085.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 561637690162 in words is "five hundred sixty-one billion, six hundred thirty-seven million, six hundred ninety thousand, one hundred sixty-two".