631621938646 has 8 divisors (see below), whose sum is σ = 953707298544. Its totient is φ = 313719505800.

The previous prime is 631621938631. The next prime is 631621938667. The reversal of 631621938646 is 646839126136.

It is a happy number.

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

It is a super-3 number, since 3×631621938646³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1045731385 + ... + 1045731988.

It is an arithmetic number, because the mean of its divisors is an integer number (119213412318).

Almost surely, 2^631621938646 is an apocalyptic number.

631621938646 is a deficient number, since it is larger than the sum of its proper divisors (322085359898).

631621938646 is a wasteful number, since it uses less digits than its factorization.

631621938646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091463526.

The product of its digits is 6718464, while the sum is 55.

The spelling of 631621938646 in words is "six hundred thirty-one billion, six hundred twenty-one million, nine hundred thirty-eight thousand, six hundred forty-six".