668434031 has 4 divisors (see below), whose sum is σ = 668547864. Its totient is φ = 668320200.

The previous prime is 668433991. The next prime is 668434043. The reversal of 668434031 is 130434866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668434031 - 2⁶ = 668433967 is a prime.

It is a super-2 number, since 2×668434031² = 893608107597817922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668433982 and 668434000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668434051) 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, 47600 + ... + 60021.

It is an arithmetic number, because the mean of its divisors is an integer number (167136966).

Almost surely, 2^668434031 is an apocalyptic number.

668434031 is a deficient number, since it is larger than the sum of its proper divisors (113833).

668434031 is a wasteful number, since it uses less digits than its factorization.

668434031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113832.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 668434031 is about 25854.0911849556. The cubic root of 668434031 is about 874.3517510432.

Adding to 668434031 its reverse (130434866), we get a palindrome (798868897).

The spelling of 668434031 in words is "six hundred sixty-eight million, four hundred thirty-four thousand, thirty-one".