64394328523 has 16 divisors (see below), whose sum is σ = 77421600000. Its totient is φ = 52388596512.

The previous prime is 64394328521. The next prime is 64394328547. The reversal of 64394328523 is 32582349346.

It is not a de Polignac number, because 64394328523 - 2¹ = 64394328521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64394328521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2676273 + ... + 2700226.

It is an arithmetic number, because the mean of its divisors is an integer number (4838850000).

Almost surely, 2^64394328523 is an apocalyptic number.

64394328523 is a deficient number, since it is larger than the sum of its proper divisors (13027271477).

64394328523 is a wasteful number, since it uses less digits than its factorization.

64394328523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376594.

The product of its digits is 3732480, while the sum is 49.

The spelling of 64394328523 in words is "sixty-four billion, three hundred ninety-four million, three hundred twenty-eight thousand, five hundred twenty-three".