64764189389 has 4 divisors (see below), whose sum is σ = 66514572924. Its totient is φ = 63013805856.

The previous prime is 64764189379. The next prime is 64764189397. The reversal of 64764189389 is 98398146746.

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 57698442025 + 7065747364 = 240205^2 + 84058^2 .

It is a cyclic number.

It is not a de Polignac number, because 64764189389 - 2²⁴ = 64747412173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64764189319) 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, 875191712 + ... + 875191785.

It is an arithmetic number, because the mean of its divisors is an integer number (16628643231).

Almost surely, 2^64764189389 is an apocalyptic number.

It is an amenable number.

64764189389 is a deficient number, since it is larger than the sum of its proper divisors (1750383535).

64764189389 is a wasteful number, since it uses less digits than its factorization.

64764189389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750383534.

The product of its digits is 62705664, while the sum is 65.

The spelling of 64764189389 in words is "sixty-four billion, seven hundred sixty-four million, one hundred eighty-nine thousand, three hundred eighty-nine".