64475889869 has 4 divisors (see below), whose sum is σ = 64478525244. Its totient is φ = 64473254496.

The previous prime is 64475889859. The next prime is 64475889899. The reversal of 64475889869 is 96898857446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47856812644 + 16619077225 = 218762^2 + 128915^2 .

It is a cyclic number.

It is not a de Polignac number, because 64475889869 - 2²⁰ = 64474841293 is a prime.

It is a super-2 number, since 2×64475889869² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64475889796 and 64475889805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64475889859) 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, 1280642 + ... + 1330035.

It is an arithmetic number, because the mean of its divisors is an integer number (16119631311).

Almost surely, 2^64475889869 is an apocalyptic number.

It is an amenable number.

64475889869 is a deficient number, since it is larger than the sum of its proper divisors (2635375).

64475889869 is a wasteful number, since it uses less digits than its factorization.

64475889869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635374.

The product of its digits is 836075520, while the sum is 74.

The spelling of 64475889869 in words is "sixty-four billion, four hundred seventy-five million, eight hundred eighty-nine thousand, eight hundred sixty-nine".