1668890931 has 8 divisors (see below), whose sum is σ = 2276936640. Its totient is φ = 1086719592.

The previous prime is 1668890911. The next prime is 1668890981. The reversal of 1668890931 is 1390988661.

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

It is not a de Polignac number, because 1668890931 - 2²³ = 1660502323 is a prime.

It is a super-2 number, since 2×1668890931² = 5570393879148093522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1668890911) 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, 6468441 + ... + 6468698.

It is an arithmetic number, because the mean of its divisors is an integer number (284617080).

Almost surely, 2^1668890931 is an apocalyptic number.

1668890931 is a deficient number, since it is larger than the sum of its proper divisors (608045709).

1668890931 is a wasteful number, since it uses less digits than its factorization.

1668890931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12937185.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 1668890931 is about 40852.0615269291. The cubic root of 1668890931 is about 1186.1582984354.

The spelling of 1668890931 in words is "one billion, six hundred sixty-eight million, eight hundred ninety thousand, nine hundred thirty-one".