666768452 has 24 divisors (see below), whose sum is σ = 1341727296. Its totient is φ = 284002848.

The previous prime is 666768437. The next prime is 666768457. The reversal of 666768452 is 254867666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 666768452.

It is not an unprimeable number, because it can be changed into a prime (666768457) 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, 68483 + ... + 77610.

It is an arithmetic number, because the mean of its divisors is an integer number (55905304).

Almost surely, 2^666768452 is an apocalyptic number.

It is an amenable number.

666768452 is an abundant number, since it is smaller than the sum of its proper divisors (674958844).

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

666768452 is a wasteful number, since it uses less digits than its factorization.

666768452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146267 (or 146265 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 50.

The square root of 666768452 is about 25821.8599639917. The cubic root of 666768452 is about 873.6249213133.

The spelling of 666768452 in words is "six hundred sixty-six million, seven hundred sixty-eight thousand, four hundred fifty-two".