6581843964 has 36 divisors (see below), whose sum is σ = 17616113424. Its totient is φ = 2064892032.

The previous prime is 6581843927. The next prime is 6581843971. The reversal of 6581843964 is 4693481856.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6581843964.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5376712 + ... + 5377935.

It is an arithmetic number, because the mean of its divisors is an integer number (489336484).

Almost surely, 2^6581843964 is an apocalyptic number.

It is an amenable number.

6581843964 is an abundant number, since it is smaller than the sum of its proper divisors (11034269460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6581843964 is a wasteful number, since it uses less digits than its factorization.

6581843964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10754674 (or 10754669 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 6581843964 is about 81128.5644147608. The cubic root of 6581843964 is about 1874.0558412341.

The spelling of 6581843964 in words is "six billion, five hundred eighty-one million, eight hundred forty-three thousand, nine hundred sixty-four".