6540555264 has 88 divisors (see below), whose sum is σ = 18191115840. Its totient is φ = 2085371904.

The previous prime is 6540555257. The next prime is 6540555277. The reversal of 6540555264 is 4625550456.

It is a happy number.

It is a super-2 number, since 2×6540555264² = 85557726322876219392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24372 + ... + 116940.

Almost surely, 2^6540555264 is an apocalyptic number.

6540555264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6540555264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9095557920).

6540555264 is an abundant number, since it is smaller than the sum of its proper divisors (11650560576).

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

6540555264 is a wasteful number, since it uses less digits than its factorization.

6540555264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92615 (or 92597 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 42.

The square root of 6540555264 is about 80873.6994578584. The cubic root of 6540555264 is about 1870.1288923330.

The spelling of 6540555264 in words is "six billion, five hundred forty million, five hundred fifty-five thousand, two hundred sixty-four".