64189939161 has 4 divisors (see below), whose sum is σ = 85586585552. Its totient is φ = 42793292772.

The previous prime is 64189939139. The next prime is 64189939199. The reversal of 64189939161 is 16193998146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64189939161 - 2¹⁸ = 64189677017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64189939861) 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, 10698323191 + ... + 10698323196.

It is an arithmetic number, because the mean of its divisors is an integer number (21396646388).

Almost surely, 2^64189939161 is an apocalyptic number.

It is an amenable number.

64189939161 is a deficient number, since it is larger than the sum of its proper divisors (21396646391).

64189939161 is a wasteful number, since it uses less digits than its factorization.

64189939161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21396646390.

The product of its digits is 2519424, while the sum is 57.

The spelling of 64189939161 in words is "sixty-four billion, one hundred eighty-nine million, nine hundred thirty-nine thousand, one hundred sixty-one".