631994564653 has 2 divisors, whose sum is σ = 631994564654. Its totient is φ = 631994564652.

The previous prime is 631994564639. The next prime is 631994564701. The reversal of 631994564653 is 356465499136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479768178409 + 152226386244 = 692653^2 + 390162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631994564653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631994564591 and 631994564600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631994564353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315997282326 + 315997282327.

It is an arithmetic number, because the mean of its divisors is an integer number (315997282327).

Almost surely, 2^631994564653 is an apocalyptic number.

It is an amenable number.

631994564653 is a deficient number, since it is larger than the sum of its proper divisors (1).

631994564653 is an equidigital number, since it uses as much as digits as its factorization.

631994564653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62985600, while the sum is 61.

The spelling of 631994564653 in words is "six hundred thirty-one billion, nine hundred ninety-four million, five hundred sixty-four thousand, six hundred fifty-three".