64669745523 has 16 divisors (see below), whose sum is σ = 90782337920. Its totient is φ = 40836047616.

The previous prime is 64669745489. The next prime is 64669745527. The reversal of 64669745523 is 32554796646.

64669745523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64669745523 - 2⁸ = 64669745267 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64669745527) 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, 189411 + ... + 406467.

It is an arithmetic number, because the mean of its divisors is an integer number (5673896120).

Almost surely, 2^64669745523 is an apocalyptic number.

64669745523 is a deficient number, since it is larger than the sum of its proper divisors (26112592397).

64669745523 is a wasteful number, since it uses less digits than its factorization.

64669745523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222306.

The product of its digits is 32659200, while the sum is 57.

The spelling of 64669745523 in words is "sixty-four billion, six hundred sixty-nine million, seven hundred forty-five thousand, five hundred twenty-three".