6666644431 has 2 divisors, whose sum is σ = 6666644432. Its totient is φ = 6666644430.

The previous prime is 6666644377. The next prime is 6666644473. The reversal of 6666644431 is 1344466666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6666644431 - 2¹³ = 6666636239 is a prime.

It is a super-2 number, since 2×6666644431² = 88888295938766627522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666641431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333322215 + 3333322216.

It is an arithmetic number, because the mean of its divisors is an integer number (3333322216).

Almost surely, 2^6666644431 is an apocalyptic number.

6666644431 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666644431 is an equidigital number, since it uses as much as digits as its factorization.

6666644431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 46.

The square root of 6666644431 is about 81649.5219275655. The cubic root of 6666644431 is about 1882.0699653034.

The spelling of 6666644431 in words is "six billion, six hundred sixty-six million, six hundred forty-four thousand, four hundred thirty-one".