6640966560 has 48 divisors (see below), whose sum is σ = 20919046176. Its totient is φ = 1770924288.

The previous prime is 6640966559. The next prime is 6640966601. The reversal of 6640966560 is 656690466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6917194 + ... + 6918153.

It is an arithmetic number, because the mean of its divisors is an integer number (435813462).

Almost surely, 2^6640966560 is an apocalyptic number.

6640966560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6640966560 is an abundant number, since it is smaller than the sum of its proper divisors (14278079616).

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

6640966560 is a wasteful number, since it uses less digits than its factorization.

6640966560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13835365 (or 13835357 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The square root of 6640966560 is about 81492.1257545783. The cubic root of 6640966560 is about 1879.6504707069.

The spelling of 6640966560 in words is "six billion, six hundred forty million, nine hundred sixty-six thousand, five hundred sixty".