666934432320 has 448 divisors, whose sum is σ = 2303255678976. Its totient is φ = 162531532800.

The previous prime is 666934432309. The next prime is 666934432331. The reversal of 666934432320 is 23234439666.

It is an interprime number because it is at equal distance from previous prime (666934432309) and next prime (666934432331).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 666934432320.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1030810237 + ... + 1030810883.

It is an arithmetic number, because the mean of its divisors is an integer number (5141195712).

Almost surely, 2^666934432320 is an apocalyptic number.

666934432320 is a gapful number since it is divisible by the number (60) 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 666934432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151627839488).

666934432320 is an abundant number, since it is smaller than the sum of its proper divisors (1636321246656).

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

666934432320 is a wasteful number, since it uses less digits than its factorization.

666934432320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 48.

The spelling of 666934432320 in words is "six hundred sixty-six billion, nine hundred thirty-four million, four hundred thirty-two thousand, three hundred twenty".