1668900731 has 2 divisors, whose sum is σ = 1668900732. Its totient is φ = 1668900730.

The previous prime is 1668900719. The next prime is 1668900743. The reversal of 1668900731 is 1370098661.

It is a balanced prime because it is at equal distance from previous prime (1668900719) and next prime (1668900743).

It is a cyclic number.

It is not a de Polignac number, because 1668900731 - 2²² = 1664706427 is a prime.

It is a super-2 number, since 2×1668900731² = 5570459299864668722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1668920731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834450365 + 834450366.

It is an arithmetic number, because the mean of its divisors is an integer number (834450366).

Almost surely, 2^1668900731 is an apocalyptic number.

1668900731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668900731 is an equidigital number, since it uses as much as digits as its factorization.

1668900731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1668900731 is about 40852.1814717403. The cubic root of 1668900731 is about 1186.1606202026.

The spelling of 1668900731 in words is "one billion, six hundred sixty-eight million, nine hundred thousand, seven hundred thirty-one".