65640500205 has 48 divisors (see below), whose sum is σ = 122696368704. Its totient is φ = 29878222080.

The previous prime is 65640500183. The next prime is 65640500281. The reversal of 65640500205 is 50200504656.

It is a happy number.

It is not a de Polignac number, because 65640500205 - 2⁶ = 65640500141 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20391 + ... + 362900.

It is an arithmetic number, because the mean of its divisors is an integer number (2556174348).

Almost surely, 2^65640500205 is an apocalyptic number.

It is an amenable number.

65640500205 is a deficient number, since it is larger than the sum of its proper divisors (57055868499).

65640500205 is a wasteful number, since it uses less digits than its factorization.

65640500205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383546 (or 383539 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 65640500205 in words is "sixty-five billion, six hundred forty million, five hundred thousand, two hundred five".