666451530 has 64 divisors (see below), whose sum is σ = 1794873600. Its totient is φ = 175953600.

The previous prime is 666451507. The next prime is 666451553. The reversal of 666451530 is 35154666.

It is an interprime number because it is at equal distance from previous prime (666451507) and next prime (666451553).

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 31 ways as a sum of consecutive naturals, for example, 15051 + ... + 39489.

It is an arithmetic number, because the mean of its divisors is an integer number (28044900).

Almost surely, 2^666451530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666451530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897436800).

666451530 is an abundant number, since it is smaller than the sum of its proper divisors (1128422070).

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

666451530 is a wasteful number, since it uses less digits than its factorization.

666451530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24556 (or 24550 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 666451530 is about 25815.7225349205. The cubic root of 666451530 is about 873.4864850317.

The spelling of 666451530 in words is "six hundred sixty-six million, four hundred fifty-one thousand, five hundred thirty".