666381930 has 32 divisors (see below), whose sum is σ = 1599998400. Its totient is φ = 177626112.

The previous prime is 666381917. The next prime is 666381943. The reversal of 666381930 is 39183666.

It is an interprime number because it is at equal distance from previous prime (666381917) and next prime (666381943).

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, 126081 + ... + 131259.

It is an arithmetic number, because the mean of its divisors is an integer number (49999950).

Almost surely, 2^666381930 is an apocalyptic number.

666381930 is an abundant number, since it is smaller than the sum of its proper divisors (933616470).

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

666381930 is a wasteful number, since it uses less digits than its factorization.

666381930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9478.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 666381930 is about 25814.3744839963. The cubic root of 666381930 is about 873.4560768309.

The spelling of 666381930 in words is "six hundred sixty-six million, three hundred eighty-one thousand, nine hundred thirty".