666025984 has 120 divisors (see below), whose sum is σ = 1486311120. Its totient is φ = 296484864.

The previous prime is 666025957. The next prime is 666026021. The reversal of 666025984 is 489520666.

It is a super-2 number, since 2×666025984² = 887181222726336512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11288547 + ... + 11288605.

It is an arithmetic number, because the mean of its divisors is an integer number (12385926).

Almost surely, 2^666025984 is an apocalyptic number.

666025984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666025984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743155560).

666025984 is an abundant number, since it is smaller than the sum of its proper divisors (820285136).

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

666025984 is an equidigital number, since it uses as much as digits as its factorization.

666025984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 666025984 is about 25807.4792259918. The cubic root of 666025984 is about 873.3005311120.

The spelling of 666025984 in words is "six hundred sixty-six million, twenty-five thousand, nine hundred eighty-four".