668427051 has 4 divisors (see below), whose sum is σ = 891236072. Its totient is φ = 445618032.

The previous prime is 668426999. The next prime is 668427073. The reversal of 668427051 is 150724866.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 668427051 - 2⁷ = 668426923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668426051) 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, 111404506 + ... + 111404511.

It is an arithmetic number, because the mean of its divisors is an integer number (222809018).

Almost surely, 2^668427051 is an apocalyptic number.

668427051 is a deficient number, since it is larger than the sum of its proper divisors (222809021).

668427051 is a wasteful number, since it uses less digits than its factorization.

668427051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222809020.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 668427051 is about 25853.9561962961. The cubic root of 668427051 is about 874.3487076132.

The spelling of 668427051 in words is "six hundred sixty-eight million, four hundred twenty-seven thousand, fifty-one".