631955026217 has 4 divisors (see below), whose sum is σ = 652340672256. Its totient is φ = 611569380180.

The previous prime is 631955026189. The next prime is 631955026229. The reversal of 631955026217 is 712620559136.

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 631955026217 - 2²⁴ = 631938249001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631955026277) 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, 10192822973 + ... + 10192823034.

It is an arithmetic number, because the mean of its divisors is an integer number (163085168064).

Almost surely, 2^631955026217 is an apocalyptic number.

It is an amenable number.

631955026217 is a deficient number, since it is larger than the sum of its proper divisors (20385646039).

631955026217 is a wasteful number, since it uses less digits than its factorization.

631955026217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20385646038.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 631955026217 in words is "six hundred thirty-one billion, nine hundred fifty-five million, twenty-six thousand, two hundred seventeen".