1966404631 has 2 divisors, whose sum is σ = 1966404632. Its totient is φ = 1966404630.

The previous prime is 1966404623. The next prime is 1966404667. The reversal of 1966404631 is 1364046691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1966404631 - 2³ = 1966404623 is a prime.

It is a super-2 number, since 2×1966404631² = 7733494345636492322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966494631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983202315 + 983202316.

It is an arithmetic number, because the mean of its divisors is an integer number (983202316).

Almost surely, 2^1966404631 is an apocalyptic number.

1966404631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966404631 is an equidigital number, since it uses as much as digits as its factorization.

1966404631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 1966404631 is about 44344.1611827307. The cubic root of 1966404631 is about 1252.8265914336.

The spelling of 1966404631 in words is "one billion, nine hundred sixty-six million, four hundred four thousand, six hundred thirty-one".