65564231646 has 32 divisors (see below), whose sum is σ = 142789622400. Its totient is φ = 19990545120.

The previous prime is 65564231587. The next prime is 65564231683. The reversal of 65564231646 is 64613246556.

It is a junction number, because it is equal to n+sod(n) for n = 65564231595 and 65564231604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9912640 + ... + 9919251.

It is an arithmetic number, because the mean of its divisors is an integer number (4462175700).

Almost surely, 2^65564231646 is an apocalyptic number.

65564231646 is an abundant number, since it is smaller than the sum of its proper divisors (77225390754).

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

65564231646 is a wasteful number, since it uses less digits than its factorization.

65564231646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19831944.

The product of its digits is 3110400, while the sum is 48.

The spelling of 65564231646 in words is "sixty-five billion, five hundred sixty-four million, two hundred thirty-one thousand, six hundred forty-six".