631681322553 has 8 divisors (see below), whose sum is σ = 935824181600. Its totient is φ = 421120881684.

The previous prime is 631681322527. The next prime is 631681322561. The reversal of 631681322553 is 355223186136.

631681322553 is a `hidden beast` number, since 6 + 3 + 1 + 68 + 1 + 32 + 2 + 553 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-631681322553 is a prime.

It is a super-3 number, since 3×631681322553³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 631681322499 and 631681322508.

It is not an unprimeable number, because it can be changed into a prime (631681320553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11697802243 + ... + 11697802296.

It is an arithmetic number, because the mean of its divisors is an integer number (116978022700).

Almost surely, 2^631681322553 is an apocalyptic number.

It is an amenable number.

631681322553 is a deficient number, since it is larger than the sum of its proper divisors (304142859047).

631681322553 is a wasteful number, since it uses less digits than its factorization.

631681322553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23395604548 (or 23395604542 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 631681322553 in words is "six hundred thirty-one billion, six hundred eighty-one million, three hundred twenty-two thousand, five hundred fifty-three".