666851492 has 12 divisors (see below), whose sum is σ = 1169513856. Its totient is φ = 332704680.

The previous prime is 666851441. The next prime is 666851513. The reversal of 666851492 is 294158666.

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 3 ways as a sum of consecutive naturals, for example, 178184 + ... + 181887.

It is an arithmetic number, because the mean of its divisors is an integer number (97459488).

Almost surely, 2^666851492 is an apocalyptic number.

It is an amenable number.

666851492 is a deficient number, since it is larger than the sum of its proper divisors (502662364).

666851492 is a wasteful number, since it uses less digits than its factorization.

666851492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360538 (or 360536 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 666851492 is about 25823.4678538728. The cubic root of 666851492 is about 873.6611871773.

The spelling of 666851492 in words is "six hundred sixty-six million, eight hundred fifty-one thousand, four hundred ninety-two".