666415268 has 24 divisors (see below), whose sum is σ = 1181922840. Its totient is φ = 328739840.

The previous prime is 666415261. The next prime is 666415279. The reversal of 666415268 is 862514666.

It can be written as a sum of positive squares in 4 ways, for example, as 362404 + 666052864 = 602^2 + 25808^2 .

It is not an unprimeable number, because it can be changed into a prime (666415261) 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, 183680 + ... + 187272.

It is an arithmetic number, because the mean of its divisors is an integer number (49246785).

Almost surely, 2^666415268 is an apocalyptic number.

It is an amenable number.

666415268 is a deficient number, since it is larger than the sum of its proper divisors (515507572).

666415268 is a wasteful number, since it uses less digits than its factorization.

666415268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207 (or 4205 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 666415268 is about 25815.0202014254. The cubic root of 666415268 is about 873.4706424485.

The spelling of 666415268 in words is "six hundred sixty-six million, four hundred fifteen thousand, two hundred sixty-eight".