6409893681 has 12 divisors (see below), whose sum is σ = 9267143808. Its totient is φ = 4269381624.

The previous prime is 6409893661. The next prime is 6409893689. The reversal of 6409893681 is 1863989046.

It is not a de Polignac number, because 6409893681 - 2¹⁵ = 6409860913 is a prime.

It is a super-2 number, since 2×6409893681² = 82173474003447459522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6409893689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312925 + ... + 332778.

It is an arithmetic number, because the mean of its divisors is an integer number (772261984).

Almost surely, 2^6409893681 is an apocalyptic number.

It is an amenable number.

6409893681 is a deficient number, since it is larger than the sum of its proper divisors (2857250127).

6409893681 is a wasteful number, since it uses less digits than its factorization.

6409893681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646812 (or 646809 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 6409893681 is about 80061.8116270173. The cubic root of 6409893681 is about 1857.5917575270.

The spelling of 6409893681 in words is "six billion, four hundred nine million, eight hundred ninety-three thousand, six hundred eighty-one".