561630018 has 32 divisors (see below), whose sum is σ = 1134435456. Its totient is φ = 185356928.

The previous prime is 561629983. The next prime is 561630019. The reversal of 561630018 is 810036165.

It is not an unprimeable number, because it can be changed into a prime (561630019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292630 + ... + 294542.

It is an arithmetic number, because the mean of its divisors is an integer number (35451108).

Almost surely, 2^561630018 is an apocalyptic number.

561630018 is an abundant number, since it is smaller than the sum of its proper divisors (572805438).

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

561630018 is a wasteful number, since it uses less digits than its factorization.

561630018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 561630018 is about 23698.7345231765. The cubic root of 561630018 is about 825.0560197038.

The spelling of 561630018 in words is "five hundred sixty-one million, six hundred thirty thousand, eighteen".