64189172771 has 4 divisors (see below), whose sum is σ = 64208446344. Its totient is φ = 64169899200.

The previous prime is 64189172699. The next prime is 64189172783. The reversal of 64189172771 is 17727198146.

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

It is a cyclic number.

It is not a de Polignac number, because 64189172771 - 2¹⁰ = 64189171747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64189172791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9631790 + ... + 9638451.

It is an arithmetic number, because the mean of its divisors is an integer number (16052111586).

Almost surely, 2^64189172771 is an apocalyptic number.

64189172771 is a deficient number, since it is larger than the sum of its proper divisors (19273573).

64189172771 is a wasteful number, since it uses less digits than its factorization.

64189172771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19273572.

The product of its digits is 1185408, while the sum is 53.

The spelling of 64189172771 in words is "sixty-four billion, one hundred eighty-nine million, one hundred seventy-two thousand, seven hundred seventy-one".