631666602551 has 2 divisors, whose sum is σ = 631666602552. Its totient is φ = 631666602550.

The previous prime is 631666602529. The next prime is 631666602557. The reversal of 631666602551 is 155206666136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631666602551 - 2¹⁴ = 631666586167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631666602496 and 631666602505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631666602557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315833301275 + 315833301276.

It is an arithmetic number, because the mean of its divisors is an integer number (315833301276).

Almost surely, 2^631666602551 is an apocalyptic number.

631666602551 is a deficient number, since it is larger than the sum of its proper divisors (1).

631666602551 is an equidigital number, since it uses as much as digits as its factorization.

631666602551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 631666602551 in words is "six hundred thirty-one billion, six hundred sixty-six million, six hundred two thousand, five hundred fifty-one".