631666733629 has 2 divisors, whose sum is σ = 631666733630. Its totient is φ = 631666733628.

The previous prime is 631666733623. The next prime is 631666733647. The reversal of 631666733629 is 926337666136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631444783225 + 221950404 = 794635^2 + 14898^2 .

It is a cyclic number.

It is not a de Polignac number, because 631666733629 - 2⁷ = 631666733501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631666733623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315833366814 + 315833366815.

It is an arithmetic number, because the mean of its divisors is an integer number (315833366815).

Almost surely, 2^631666733629 is an apocalyptic number.

It is an amenable number.

631666733629 is a deficient number, since it is larger than the sum of its proper divisors (1).

631666733629 is an equidigital number, since it uses as much as digits as its factorization.

631666733629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 58.

The spelling of 631666733629 in words is "six hundred thirty-one billion, six hundred sixty-six million, seven hundred thirty-three thousand, six hundred twenty-nine".