668513741 has 4 divisors (see below), whose sum is σ = 764015712. Its totient is φ = 573011772.

The previous prime is 668513737. The next prime is 668513753. The reversal of 668513741 is 147315866.

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, and also an emirpimes, since its reverse is a distinct semiprime: 147315866 = 2 ⋅73657933.

It is a cyclic number.

It is not a de Polignac number, because 668513741 - 2² = 668513737 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 (668513711) 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, 47750975 + ... + 47750988.

It is an arithmetic number, because the mean of its divisors is an integer number (191003928).

Almost surely, 2^668513741 is an apocalyptic number.

It is an amenable number.

668513741 is a deficient number, since it is larger than the sum of its proper divisors (95501971).

668513741 is an equidigital number, since it uses as much as digits as its factorization.

668513741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95501970.

The product of its digits is 120960, while the sum is 41.

The square root of 668513741 is about 25855.6326745257. The cubic root of 668513741 is about 874.3865048133.

The spelling of 668513741 in words is "six hundred sixty-eight million, five hundred thirteen thousand, seven hundred forty-one".