561698066 has 4 divisors (see below), whose sum is σ = 842547102. Its totient is φ = 280849032.

The previous prime is 561698057. The next prime is 561698141. The reversal of 561698066 is 660896165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 288490225 + 273207841 = 16985^2 + 16529^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 561698066.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140424515 + ... + 140424518.

Almost surely, 2^561698066 is an apocalyptic number.

561698066 is a deficient number, since it is larger than the sum of its proper divisors (280849036).

561698066 is a wasteful number, since it uses less digits than its factorization.

561698066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280849035.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 561698066 is about 23700.1701681655. The cubic root of 561698066 is about 825.0893400647.

The spelling of 561698066 in words is "five hundred sixty-one million, six hundred ninety-eight thousand, sixty-six".