64347667889 has 4 divisors (see below), whose sum is σ = 64348370724. Its totient is φ = 64346965056.

The previous prime is 64347667877. The next prime is 64347667927. The reversal of 64347667889 is 98876674346.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98876674346 = 2 ⋅49438337173.

It can be written as a sum of positive squares in 2 ways, for example, as 14440107889 + 49907560000 = 120167^2 + 223400^2 .

It is a cyclic number.

It is not a de Polignac number, because 64347667889 - 2⁸ = 64347667633 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 (64347660889) 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, 189092 + ... + 405525.

It is an arithmetic number, because the mean of its divisors is an integer number (16087092681).

Almost surely, 2^64347667889 is an apocalyptic number.

It is an amenable number.

64347667889 is a deficient number, since it is larger than the sum of its proper divisors (702835).

64347667889 is a wasteful number, since it uses less digits than its factorization.

64347667889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702834.

The product of its digits is 292626432, while the sum is 68.

The spelling of 64347667889 in words is "sixty-four billion, three hundred forty-seven million, six hundred sixty-seven thousand, eight hundred eighty-nine".