6401616631 has 8 divisors (see below), whose sum is σ = 6566313600. Its totient is φ = 6237327360.

The previous prime is 6401616593. The next prime is 6401616647. The reversal of 6401616631 is 1366161046.

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 6401616631 - 2⁷ = 6401616503 is a prime.

It is a super-2 number, since 2×6401616631² = 81961390980591580322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401616691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69991 + ... + 133048.

It is an arithmetic number, because the mean of its divisors is an integer number (820789200).

Almost surely, 2^6401616631 is an apocalyptic number.

6401616631 is a deficient number, since it is larger than the sum of its proper divisors (164696969).

6401616631 is a wasteful number, since it uses less digits than its factorization.

6401616631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203849.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 6401616631 is about 80010.1033057701. The cubic root of 6401616631 is about 1856.7918481258.

Adding to 6401616631 its reverse (1366161046), we get a palindrome (7767777677).

The spelling of 6401616631 in words is "six billion, four hundred one million, six hundred sixteen thousand, six hundred thirty-one".