669669018 has 32 divisors (see below), whose sum is σ = 1360437120. Its totient is φ = 219717120.

The previous prime is 669669001. The next prime is 669669043. The reversal of 669669018 is 810966966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415398 + ... + 417006.

It is an arithmetic number, because the mean of its divisors is an integer number (42513660).

Almost surely, 2^669669018 is an apocalyptic number.

669669018 is an abundant number, since it is smaller than the sum of its proper divisors (690768102).

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

669669018 is a wasteful number, since it uses less digits than its factorization.

669669018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662.

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 669669018 is about 25877.9639461840. The cubic root of 669669018 is about 874.8898987452.

The spelling of 669669018 in words is "six hundred sixty-nine million, six hundred sixty-nine thousand, eighteen".