6401642643 has 24 divisors (see below), whose sum is σ = 10102847040. Its totient is φ = 3873856560.

The previous prime is 6401642633. The next prime is 6401642719. The reversal of 6401642643 is 3462461046.

6401642643 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 6 + 4 + 2 + 643 = 666.

It is not a de Polignac number, because 6401642643 - 2²⁵ = 6368088211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6401642598 and 6401642607.

It is not an unprimeable number, because it can be changed into a prime (6401642633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16180 + ... + 114302.

It is an arithmetic number, because the mean of its divisors is an integer number (420951960).

Almost surely, 2^6401642643 is an apocalyptic number.

6401642643 is a deficient number, since it is larger than the sum of its proper divisors (3701204397).

6401642643 is a wasteful number, since it uses less digits than its factorization.

6401642643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98799 (or 98796 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6401642643 is about 80010.2658600757. The cubic root of 6401642643 is about 1856.7943630533.

The spelling of 6401642643 in words is "six billion, four hundred one million, six hundred forty-two thousand, six hundred forty-three".