668753541 has 6 divisors (see below), whose sum is σ = 965977350. Its totient is φ = 445835688.

The previous prime is 668753537. The next prime is 668753573. The reversal of 668753541 is 145357866.

It can be written as a sum of positive squares in only one way, i.e., 654848100 + 13905441 = 25590^2 + 3729^2 .

It is not a de Polignac number, because 668753541 - 2² = 668753537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668753521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37152966 + ... + 37152983.

It is an arithmetic number, because the mean of its divisors is an integer number (160996225).

Almost surely, 2^668753541 is an apocalyptic number.

It is an amenable number.

668753541 is a deficient number, since it is larger than the sum of its proper divisors (297223809).

668753541 is a wasteful number, since it uses less digits than its factorization.

668753541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74305955 (or 74305952 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 668753541 is about 25860.2695461590. The cubic root of 668753541 is about 874.4910415914.

The spelling of 668753541 in words is "six hundred sixty-eight million, seven hundred fifty-three thousand, five hundred forty-one".