6641856431 has 8 divisors (see below), whose sum is σ = 7591411104. Its totient is φ = 5692481280.

The previous prime is 6641856413. The next prime is 6641856451. The reversal of 6641856431 is 1346581466.

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 6641856431 - 2⁶ = 6641856367 is a prime.

It is a super-2 number, since 2×6641856431² = 88228513700032115522, 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 (6641856451) 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, 46931 + ... + 124443.

It is an arithmetic number, because the mean of its divisors is an integer number (948926388).

Almost surely, 2^6641856431 is an apocalyptic number.

6641856431 is a deficient number, since it is larger than the sum of its proper divisors (949554673).

6641856431 is a wasteful number, since it uses less digits than its factorization.

6641856431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89761.

The product of its digits is 414720, while the sum is 44.

The square root of 6641856431 is about 81497.5854304899. The cubic root of 6641856431 is about 1879.7344229311.

The spelling of 6641856431 in words is "six billion, six hundred forty-one million, eight hundred fifty-six thousand, four hundred thirty-one".