666951432 has 64 divisors (see below), whose sum is σ = 1946142720. Its totient is φ = 186500928.

The previous prime is 666951421. The next prime is 666951443. The reversal of 666951432 is 234159666.

It is an interprime number because it is at equal distance from previous prime (666951421) and next prime (666951443).

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 34338 + ... + 50129.

It is an arithmetic number, because the mean of its divisors is an integer number (30408480).

Almost surely, 2^666951432 is an apocalyptic number.

It is an amenable number.

666951432 is an abundant number, since it is smaller than the sum of its proper divisors (1279191288).

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

666951432 is a wasteful number, since it uses less digits than its factorization.

666951432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84530 (or 84526 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 666951432 is about 25825.4028429374. The cubic root of 666951432 is about 873.7048297467.

The spelling of 666951432 in words is "six hundred sixty-six million, nine hundred fifty-one thousand, four hundred thirty-two".