245642666 has 8 divisors (see below), whose sum is σ = 369627300. Its totient is φ = 122433568.

The previous prime is 245642647. The next prime is 245642687. The reversal of 245642666 is 666246542.

245642666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 181306225 + 64336441 = 13465^2 + 8021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193091 + ... + 194358.

Almost surely, 2^245642666 is an apocalyptic number.

245642666 is a deficient number, since it is larger than the sum of its proper divisors (123984634).

245642666 is a wasteful number, since it uses less digits than its factorization.

245642666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387768.

The product of its digits is 414720, while the sum is 41.

The square root of 245642666 is about 15672.9916097725. The cubic root of 245642666 is about 626.2791220224.

The spelling of 245642666 in words is "two hundred forty-five million, six hundred forty-two thousand, six hundred sixty-six".