64166506563 has 4 divisors (see below), whose sum is σ = 85555342088. Its totient is φ = 42777671040.

The previous prime is 64166506549. The next prime is 64166506589. The reversal of 64166506563 is 36560566146.

64166506563 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 not a de Polignac number, because 64166506563 - 2¹² = 64166502467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64166507563) 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, 10694417758 + ... + 10694417763.

It is an arithmetic number, because the mean of its divisors is an integer number (21388835522).

Almost surely, 2^64166506563 is an apocalyptic number.

64166506563 is a deficient number, since it is larger than the sum of its proper divisors (21388835525).

64166506563 is a wasteful number, since it uses less digits than its factorization.

64166506563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21388835524.

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 64166506563 in words is "sixty-four billion, one hundred sixty-six million, five hundred six thousand, five hundred sixty-three".