64656512563 has 4 divisors (see below), whose sum is σ = 64685810880. Its totient is φ = 64627214248.

The previous prime is 64656512549. The next prime is 64656512587. The reversal of 64656512563 is 36521565646.

64656512563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64656512563 - 2³³ = 56066577971 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64656512533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14645848 + ... + 14650261.

It is an arithmetic number, because the mean of its divisors is an integer number (16171452720).

Almost surely, 2^64656512563 is an apocalyptic number.

64656512563 is a deficient number, since it is larger than the sum of its proper divisors (29298317).

64656512563 is a wasteful number, since it uses less digits than its factorization.

64656512563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29298316.

The product of its digits is 3888000, while the sum is 49.

The spelling of 64656512563 in words is "sixty-four billion, six hundred fifty-six million, five hundred twelve thousand, five hundred sixty-three".