666512442 has 16 divisors (see below), whose sum is σ = 1481138880. Its totient is φ = 222170796.

The previous prime is 666512401. The next prime is 666512443. The reversal of 666512442 is 244215666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666512397 and 666512406.

It is not an unprimeable number, because it can be changed into a prime (666512443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6171358 + ... + 6171465.

It is an arithmetic number, because the mean of its divisors is an integer number (92571180).

Almost surely, 2^666512442 is an apocalyptic number.

666512442 is an abundant number, since it is smaller than the sum of its proper divisors (814626438).

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

666512442 is a wasteful number, since it uses less digits than its factorization.

666512442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12342834 (or 12342828 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 666512442 is about 25816.9022541435. The cubic root of 666512442 is about 873.5130957131.

The spelling of 666512442 in words is "six hundred sixty-six million, five hundred twelve thousand, four hundred forty-two".