668227751 has 4 divisors (see below), whose sum is σ = 671224512. Its totient is φ = 665230992.

The previous prime is 668227727. The next prime is 668227759. The reversal of 668227751 is 157722866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668227751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668227759) 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, 1498046 + ... + 1498491.

It is an arithmetic number, because the mean of its divisors is an integer number (167806128).

Almost surely, 2^668227751 is an apocalyptic number.

668227751 is a deficient number, since it is larger than the sum of its proper divisors (2996761).

668227751 is a wasteful number, since it uses less digits than its factorization.

668227751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996760.

The product of its digits is 282240, while the sum is 44.

The square root of 668227751 is about 25850.1015665316. The cubic root of 668227751 is about 874.2617995908.

The spelling of 668227751 in words is "six hundred sixty-eight million, two hundred twenty-seven thousand, seven hundred fifty-one".