631163158561 has 16 divisors (see below), whose sum is σ = 686655353664. Its totient is φ = 576692241984.

The previous prime is 631163158543. The next prime is 631163158583. The reversal of 631163158561 is 165851361136.

It is a cyclic number.

It is not a de Polignac number, because 631163158561 - 2⁵ = 631163158529 is a prime.

It is a super-3 number, since 3×631163158561³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631163152561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107631 + ... + 1128676.

It is an arithmetic number, because the mean of its divisors is an integer number (42915959604).

Almost surely, 2^631163158561 is an apocalyptic number.

It is an amenable number.

631163158561 is a deficient number, since it is larger than the sum of its proper divisors (55492195103).

631163158561 is a wasteful number, since it uses less digits than its factorization.

631163158561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236720.

The product of its digits is 388800, while the sum is 46.

The spelling of 631163158561 in words is "six hundred thirty-one billion, one hundred sixty-three million, one hundred fifty-eight thousand, five hundred sixty-one".