660890818 has 16 divisors (see below), whose sum is σ = 1163577024. Its totient is φ = 275583600.

The previous prime is 660890807. The next prime is 660890821. The reversal of 660890818 is 818098066.

It is a super-4 number, since 4×660890818⁴ (a number of 36 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637408 + ... + 638443.

It is an arithmetic number, because the mean of its divisors is an integer number (72723564).

Almost surely, 2^660890818 is an apocalyptic number.

660890818 is a deficient number, since it is larger than the sum of its proper divisors (502686206).

660890818 is a wasteful number, since it uses less digits than its factorization.

660890818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275897.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 660890818 is about 25707.7968328677. The cubic root of 660890818 is about 871.0503094289.

The spelling of 660890818 in words is "six hundred sixty million, eight hundred ninety thousand, eight hundred eighteen".