666417238 has 24 divisors (see below), whose sum is σ = 1064860200. Its totient is φ = 312730368.

The previous prime is 666417223. The next prime is 666417263. The reversal of 666417238 is 832714666.

It is a super-2 number, since 2×666417238² = 888223870207097288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666417194 and 666417203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234993 + ... + 237811.

It is an arithmetic number, because the mean of its divisors is an integer number (44369175).

Almost surely, 2^666417238 is an apocalyptic number.

666417238 is a deficient number, since it is larger than the sum of its proper divisors (398442962).

666417238 is a wasteful number, since it uses less digits than its factorization.

666417238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264 (or 3247 counting only the distinct ones).

The product of its digits is 290304, while the sum is 43.

The square root of 666417238 is about 25815.0583574781. The cubic root of 666417238 is about 873.4715031408.

The spelling of 666417238 in words is "six hundred sixty-six million, four hundred seventeen thousand, two hundred thirty-eight".