631433142661 has 2 divisors, whose sum is σ = 631433142662. Its totient is φ = 631433142660.

The previous prime is 631433142611. The next prime is 631433142679. The reversal of 631433142661 is 166241334136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574858141636 + 56575001025 = 758194^2 + 237855^2 .

It is a cyclic number.

It is not a de Polignac number, because 631433142661 - 2¹⁹ = 631432618373 is a prime.

It is a super-3 number, since 3×631433142661³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631433142611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315716571330 + 315716571331.

It is an arithmetic number, because the mean of its divisors is an integer number (315716571331).

Almost surely, 2^631433142661 is an apocalyptic number.

It is an amenable number.

631433142661 is a deficient number, since it is larger than the sum of its proper divisors (1).

631433142661 is an equidigital number, since it uses as much as digits as its factorization.

631433142661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 40.

Adding to 631433142661 its reverse (166241334136), we get a palindrome (797674476797).

The spelling of 631433142661 in words is "six hundred thirty-one billion, four hundred thirty-three million, one hundred forty-two thousand, six hundred sixty-one".