668012947 has 8 divisors (see below), whose sum is σ = 770200416. Its totient is φ = 567514752.

The previous prime is 668012929. The next prime is 668012971. The reversal of 668012947 is 749210866.

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

It is not a de Polignac number, because 668012947 - 2⁷ = 668012819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668012047) 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, 421468 + ... + 423049.

It is an arithmetic number, because the mean of its divisors is an integer number (96275052).

Almost surely, 2^668012947 is an apocalyptic number.

668012947 is a deficient number, since it is larger than the sum of its proper divisors (102187469).

668012947 is a wasteful number, since it uses less digits than its factorization.

668012947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844637.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 668012947 is about 25845.9464326614. The cubic root of 668012947 is about 874.1681114447.

The spelling of 668012947 in words is "six hundred sixty-eight million, twelve thousand, nine hundred forty-seven".