631686561107 has 8 divisors (see below), whose sum is σ = 727197043296. Its totient is φ = 537493465152.

The previous prime is 631686561091. The next prime is 631686561113. The reversal of 631686561107 is 701165686136.

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

It is not a de Polignac number, because 631686561107 - 2⁴ = 631686561091 is a prime.

It is a super-2 number, since 2×631686561107² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631686561137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329345528 + ... + 329347445.

It is an arithmetic number, because the mean of its divisors is an integer number (90899630412).

Almost surely, 2^631686561107 is an apocalyptic number.

631686561107 is a deficient number, since it is larger than the sum of its proper divisors (95510482189).

631686561107 is a wasteful number, since it uses less digits than its factorization.

631686561107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658693117.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 631686561107 in words is "six hundred thirty-one billion, six hundred eighty-six million, five hundred sixty-one thousand, one hundred seven".