253680666 has 16 divisors (see below), whose sum is σ = 534064800. Its totient is φ = 80109648.

The previous prime is 253680659. The next prime is 253680671. The reversal of 253680666 is 666086352.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112521 + ... + 1112748.

It is an arithmetic number, because the mean of its divisors is an integer number (33379050).

Almost surely, 2^253680666 is an apocalyptic number.

253680666 is an abundant number, since it is smaller than the sum of its proper divisors (280384134).

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

253680666 is a wasteful number, since it uses less digits than its factorization.

253680666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225293.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 253680666 is about 15927.3559010904. The cubic root of 253680666 is about 633.0370415246.

The spelling of 253680666 in words is "two hundred fifty-three million, six hundred eighty thousand, six hundred sixty-six".