32640065664 has 64 divisors (see below), whose sum is σ = 89496986880. Its totient is φ = 10529049600.

The previous prime is 32640065621. The next prime is 32640065687. The reversal of 32640065664 is 46656004623.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×32640065664³ (a number of 33 digits) contains 333 as substring.

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, 1359067 + ... + 1382874.

It is an arithmetic number, because the mean of its divisors is an integer number (1398390420).

Almost surely, 2^32640065664 is an apocalyptic number.

It is an amenable number.

32640065664 is an abundant number, since it is smaller than the sum of its proper divisors (56856921216).

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

32640065664 is a wasteful number, since it uses less digits than its factorization.

32640065664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741989 (or 2741977 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 32640065664 in words is "thirty-two billion, six hundred forty million, sixty-five thousand, six hundred sixty-four".