6640537560 has 32 divisors (see below), whose sum is σ = 19921613040. Its totient is φ = 1770809984.

The previous prime is 6640537543. The next prime is 6640537583. The reversal of 6640537560 is 657350466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27668787 + ... + 27669026.

Almost surely, 2^6640537560 is an apocalyptic number.

6640537560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6640537560 is an abundant number, since it is smaller than the sum of its proper divisors (13281075480).

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

6640537560 is a wasteful number, since it uses less digits than its factorization.

6640537560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55337827 (or 55337823 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 42.

The square root of 6640537560 is about 81489.4935559180. The cubic root of 6640537560 is about 1879.6099953028.

The spelling of 6640537560 in words is "six billion, six hundred forty million, five hundred thirty-seven thousand, five hundred sixty".