666030640 has 40 divisors (see below), whose sum is σ = 1689298128. Its totient is φ = 242192640.

The previous prime is 666030637. The next prime is 666030643. The reversal of 666030640 is 46030666.

It is an interprime number because it is at equal distance from previous prime (666030637) and next prime (666030643).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (666030643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377547 + ... + 379306.

Almost surely, 2^666030640 is an apocalyptic number.

It is an amenable number.

666030640 is an abundant number, since it is smaller than the sum of its proper divisors (1023267488).

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

666030640 is a wasteful number, since it uses less digits than its factorization.

666030640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756877 (or 756871 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 666030640 is about 25807.5694322422. The cubic root of 666030640 is about 873.3025661066.

The spelling of 666030640 in words is "six hundred sixty-six million, thirty thousand, six hundred forty".