631626465161 has 4 divisors (see below), whose sum is σ = 631628496000. Its totient is φ = 631624434324.

The previous prime is 631626465139. The next prime is 631626465179. The reversal of 631626465161 is 161564626136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631626465161 - 2¹⁴ = 631626448777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631626465101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440321 + ... + 1207118.

It is an arithmetic number, because the mean of its divisors is an integer number (157907124000).

Almost surely, 2^631626465161 is an apocalyptic number.

It is an amenable number.

631626465161 is a deficient number, since it is larger than the sum of its proper divisors (2030839).

631626465161 is a wasteful number, since it uses less digits than its factorization.

631626465161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030838.

The product of its digits is 933120, while the sum is 47.

The spelling of 631626465161 in words is "six hundred thirty-one billion, six hundred twenty-six million, four hundred sixty-five thousand, one hundred sixty-one".