669481018 has 16 divisors (see below), whose sum is σ = 1042921440. Its totient is φ = 322073136.

The previous prime is 669481003. The next prime is 669481031. The reversal of 669481018 is 810184966.

It is a Harshad number since it is a multiple of its sum of digits (43).

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, 52333 + ... + 63856.

It is an arithmetic number, because the mean of its divisors is an integer number (65182590).

Almost surely, 2^669481018 is an apocalyptic number.

669481018 is a deficient number, since it is larger than the sum of its proper divisors (373440422).

669481018 is a wasteful number, since it uses less digits than its factorization.

669481018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116301.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 669481018 is about 25874.3312570586. The cubic root of 669481018 is about 874.8080201401.

The spelling of 669481018 in words is "six hundred sixty-nine million, four hundred eighty-one thousand, eighteen".