668472539 has 8 divisors (see below), whose sum is σ = 781735680. Its totient is φ = 559651176.

The previous prime is 668472527. The next prime is 668472583. The reversal of 668472539 is 935274866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668472539 - 2⁴ = 668472523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668072539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110119 + ... + 1110720.

It is an arithmetic number, because the mean of its divisors is an integer number (97716960).

Almost surely, 2^668472539 is an apocalyptic number.

668472539 is a deficient number, since it is larger than the sum of its proper divisors (113263141).

668472539 is a wasteful number, since it uses less digits than its factorization.

668472539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220889.

The product of its digits is 2177280, while the sum is 50.

The square root of 668472539 is about 25854.8358919565. The cubic root of 668472539 is about 874.3685409776.

The spelling of 668472539 in words is "six hundred sixty-eight million, four hundred seventy-two thousand, five hundred thirty-nine".