6466666631 has 2 divisors, whose sum is σ = 6466666632. Its totient is φ = 6466666630.

The previous prime is 6466666627. The next prime is 6466666667. The reversal of 6466666631 is 1366666646.

6466666631 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6466666631 - 2² = 6466666627 is a prime.

It is a super-2 number, since 2×6466666631² = 83635554632977780322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6466666631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6466666331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233333315 + 3233333316.

It is an arithmetic number, because the mean of its divisors is an integer number (3233333316).

Almost surely, 2^6466666631 is an apocalyptic number.

6466666631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466666631 is an equidigital number, since it uses as much as digits as its factorization.

6466666631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 50.

The square root of 6466666631 is about 80415.5869903342. The cubic root of 6466666631 is about 1863.0599256178.

The spelling of 6466666631 in words is "six billion, four hundred sixty-six million, six hundred sixty-six thousand, six hundred thirty-one".