631672426565 has 8 divisors (see below), whose sum is σ = 778493585400. Its totient is φ = 491680158912.

The previous prime is 631672426513. The next prime is 631672426601. The reversal of 631672426565 is 565624276136.

It can be written as a sum of positive squares in 4 ways, for example, as 196094866276 + 435577560289 = 442826^2 + 659983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 631672426565 - 2¹⁴ = 631672410181 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707222590 + ... + 1707222959.

It is an arithmetic number, because the mean of its divisors is an integer number (97311698175).

Almost surely, 2^631672426565 is an apocalyptic number.

It is an amenable number.

631672426565 is a deficient number, since it is larger than the sum of its proper divisors (146821158835).

631672426565 is a wasteful number, since it uses less digits than its factorization.

631672426565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414445591.

The product of its digits is 10886400, while the sum is 53.

The spelling of 631672426565 in words is "six hundred thirty-one billion, six hundred seventy-two million, four hundred twenty-six thousand, five hundred sixty-five".