668201751 has 16 divisors (see below), whose sum is σ = 1131347200. Its totient is φ = 381829464.

The previous prime is 668201749. The next prime is 668201767. The reversal of 668201751 is 157102866.

It is not a de Polignac number, because 668201751 - 2¹ = 668201749 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 (668201701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1767541 + ... + 1767918.

It is an arithmetic number, because the mean of its divisors is an integer number (70709200).

Almost surely, 2^668201751 is an apocalyptic number.

668201751 is a deficient number, since it is larger than the sum of its proper divisors (463145449).

668201751 is a wasteful number, since it uses less digits than its factorization.

668201751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535475 (or 3535469 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 668201751 is about 25849.5986622617. The cubic root of 668201751 is about 874.2504605917.

The spelling of 668201751 in words is "six hundred sixty-eight million, two hundred one thousand, seven hundred fifty-one".