1668628431 has 40 divisors (see below), whose sum is σ = 2655649920. Its totient is φ = 1041093648.

The previous prime is 1668628417. The next prime is 1668628433. The reversal of 1668628431 is 1348268661.

1668628431 is a `hidden beast` number, since 16 + 6 + 8 + 628 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 1668628431 - 2¹⁰ = 1668627407 is a prime.

It is a super-2 number, since 2×1668628431² = 5568641681483043522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668628433) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 121206 + ... + 134268.

It is an arithmetic number, because the mean of its divisors is an integer number (66391248).

Almost surely, 2^1668628431 is an apocalyptic number.

1668628431 is a deficient number, since it is larger than the sum of its proper divisors (987021489).

1668628431 is a wasteful number, since it uses less digits than its factorization.

1668628431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13177 (or 13168 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 1668628431 is about 40848.8485884241. The cubic root of 1668628431 is about 1186.0961048605.

The spelling of 1668628431 in words is "one billion, six hundred sixty-eight million, six hundred twenty-eight thousand, four hundred thirty-one".