631281641638 has 24 divisors (see below), whose sum is σ = 1009639987200. Its totient is φ = 295969277568.

The previous prime is 631281641603. The next prime is 631281641647. The reversal of 631281641638 is 836146182136.

631281641638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×631281641638² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 631281641591 and 631281641600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1874598 + ... + 2185561.

It is an arithmetic number, because the mean of its divisors is an integer number (42068332800).

Almost surely, 2^631281641638 is an apocalyptic number.

631281641638 is a deficient number, since it is larger than the sum of its proper divisors (378358345562).

631281641638 is a wasteful number, since it uses less digits than its factorization.

631281641638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060464 (or 4060447 counting only the distinct ones).

The product of its digits is 995328, while the sum is 49.

The spelling of 631281641638 in words is "six hundred thirty-one billion, two hundred eighty-one million, six hundred forty-one thousand, six hundred thirty-eight".