6540370864 has 20 divisors (see below), whose sum is σ = 12966666856. Its totient is φ = 3194134272.

The previous prime is 6540370861. The next prime is 6540370891. The reversal of 6540370864 is 4680730456.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 6540370864.

It is not an unprimeable number, because it can be changed into a prime (6540370861) 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, 4752489 + ... + 4753864.

Almost surely, 2^6540370864 is an apocalyptic number.

It is an amenable number.

6540370864 is a deficient number, since it is larger than the sum of its proper divisors (6426295992).

6540370864 is a wasteful number, since it uses less digits than its factorization.

6540370864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506404 (or 9506398 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 6540370864 is about 80872.5594005779. The cubic root of 6540370864 is about 1870.1113171173. Note that the first 3 decimals are identical.

The spelling of 6540370864 in words is "six billion, five hundred forty million, three hundred seventy thousand, eight hundred sixty-four".