6461143643 has 4 divisors (see below), whose sum is σ = 6462551928. Its totient is φ = 6459735360.

The previous prime is 6461143609. The next prime is 6461143651. The reversal of 6461143643 is 3463411646.

It is a happy number.

6461143643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6461143643 - 2⁸ = 6461143387 is a prime.

It is a super-2 number, since 2×6461143643² = 83492754350958622898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6461143597 and 6461143606.

It is not an unprimeable number, because it can be changed into a prime (6461140643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697238 + ... + 706443.

It is an arithmetic number, because the mean of its divisors is an integer number (1615637982).

Almost surely, 2^6461143643 is an apocalyptic number.

6461143643 is a deficient number, since it is larger than the sum of its proper divisors (1408285).

6461143643 is a wasteful number, since it uses less digits than its factorization.

6461143643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408284.

The product of its digits is 124416, while the sum is 38.

The square root of 6461143643 is about 80381.2393721321. The cubic root of 6461143643 is about 1862.5293798227.

The spelling of 6461143643 in words is "six billion, four hundred sixty-one million, one hundred forty-three thousand, six hundred forty-three".