668646015 has 8 divisors (see below), whose sum is σ = 1069833648. Its totient is φ = 356611200.

The previous prime is 668646007. The next prime is 668646019. The reversal of 668646015 is 510646866.

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

It is not a de Polignac number, because 668646015 - 2³ = 668646007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668646019) 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, 22288186 + ... + 22288215.

It is an arithmetic number, because the mean of its divisors is an integer number (133729206).

Almost surely, 2^668646015 is an apocalyptic number.

668646015 is a deficient number, since it is larger than the sum of its proper divisors (401187633).

668646015 is a wasteful number, since it uses less digits than its factorization.

668646015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44576409.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 668646015 is about 25858.1904819343. The cubic root of 668646015 is about 874.4441705306. Note that the first 3 decimals are identical.

The spelling of 668646015 in words is "six hundred sixty-eight million, six hundred forty-six thousand, fifteen".