668453865 has 8 divisors (see below), whose sum is σ = 1069526208. Its totient is φ = 356508720.

The previous prime is 668453843. The next prime is 668453879. The reversal of 668453865 is 568354866.

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

It is not a de Polignac number, because 668453865 - 2¹⁴ = 668437481 is a prime.

It is a Curzon number.

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, 22281781 + ... + 22281810.

It is an arithmetic number, because the mean of its divisors is an integer number (133690776).

Almost surely, 2^668453865 is an apocalyptic number.

It is an amenable number.

668453865 is a deficient number, since it is larger than the sum of its proper divisors (401072343).

668453865 is a wasteful number, since it uses less digits than its factorization.

668453865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44563599.

The product of its digits is 4147200, while the sum is 51.

The square root of 668453865 is about 25854.4747577668. The cubic root of 668453865 is about 874.3603989777.

The spelling of 668453865 in words is "six hundred sixty-eight million, four hundred fifty-three thousand, eight hundred sixty-five".