661362018 has 32 divisors (see below), whose sum is σ = 1343526912. Its totient is φ = 216997200.

The previous prime is 661362007. The next prime is 661362041. The reversal of 661362018 is 810263166.

It is a self number, because there is not a number n which added to its sum of digits gives 661362018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464055 + ... + 465477.

It is an arithmetic number, because the mean of its divisors is an integer number (41985216).

Almost surely, 2^661362018 is an apocalyptic number.

661362018 is an abundant number, since it is smaller than the sum of its proper divisors (682164894).

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

661362018 is a wasteful number, since it uses less digits than its factorization.

661362018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 661362018 is about 25716.9597347742. The cubic root of 661362018 is about 871.2572732161.

The spelling of 661362018 in words is "six hundred sixty-one million, three hundred sixty-two thousand, eighteen".