666613250 has 16 divisors (see below), whose sum is σ = 1247900472. Its totient is φ = 266645200.

The previous prime is 666613247. The next prime is 666613253. The reversal of 666613250 is 52316666.

It is an interprime number because it is at equal distance from previous prime (666613247) and next prime (666613253).

It can be written as a sum of positive squares in 4 ways, for example, as 37957921 + 628655329 = 6161^2 + 25073^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 666613250.

It is not an unprimeable number, because it can be changed into a prime (666613253) 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, 1332977 + ... + 1333476.

Almost surely, 2^666613250 is an apocalyptic number.

666613250 is a deficient number, since it is larger than the sum of its proper divisors (581287222).

666613250 is a wasteful number, since it uses less digits than its factorization.

666613250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666470 (or 2666460 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 666613250 is about 25818.8545446927. The cubic root of 666613250 is about 873.5571322349.

The spelling of 666613250 in words is "six hundred sixty-six million, six hundred thirteen thousand, two hundred fifty".