247245666 has 8 divisors (see below), whose sum is σ = 494491344. Its totient is φ = 82415220.

The previous prime is 247245631. The next prime is 247245667. The reversal of 247245666 is 666542742.

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

247245666 is an admirable number.

It is a super-2 number, since 2×247245666² = 122260838711567112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247245667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20603800 + ... + 20603811.

It is an arithmetic number, because the mean of its divisors is an integer number (61811418).

Almost surely, 2^247245666 is an apocalyptic number.

247245666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

247245666 is a wasteful number, since it uses less digits than its factorization.

247245666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41207616.

The product of its digits is 483840, while the sum is 42.

The square root of 247245666 is about 15724.0473797302. The cubic root of 247245666 is about 627.6384807833.

The spelling of 247245666 in words is "two hundred forty-seven million, two hundred forty-five thousand, six hundred sixty-six".