666723402 has 24 divisors (see below), whose sum is σ = 1507375584. Its totient is φ = 212578344.

The previous prime is 666723401. The next prime is 666723443. The reversal of 666723402 is 204327666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666723401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 804808 + ... + 805635.

It is an arithmetic number, because the mean of its divisors is an integer number (62807316).

Almost surely, 2^666723402 is an apocalyptic number.

666723402 is an abundant number, since it is smaller than the sum of its proper divisors (840652182).

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

666723402 is a wasteful number, since it uses less digits than its factorization.

666723402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610474 (or 1610471 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 666723402 is about 25820.9876263477. The cubic root of 666723402 is about 873.6052454728.

The spelling of 666723402 in words is "six hundred sixty-six million, seven hundred twenty-three thousand, four hundred two".