668753533 has 4 divisors (see below), whose sum is σ = 764289760. Its totient is φ = 573217308.

The previous prime is 668753521. The next prime is 668753537. The reversal of 668753533 is 335357866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668753533 - 2²¹ = 666656381 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 (668753537) 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, 47768103 + ... + 47768116.

It is an arithmetic number, because the mean of its divisors is an integer number (191072440).

Almost surely, 2^668753533 is an apocalyptic number.

It is an amenable number.

668753533 is a deficient number, since it is larger than the sum of its proper divisors (95536227).

668753533 is an equidigital number, since it uses as much as digits as its factorization.

668753533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95536226.

The product of its digits is 1360800, while the sum is 46.

The square root of 668753533 is about 25860.2693914816. The cubic root of 668753533 is about 874.4910381044.

The spelling of 668753533 in words is "six hundred sixty-eight million, seven hundred fifty-three thousand, five hundred thirty-three".