64211643269 has 4 divisors (see below), whose sum is σ = 65024448960. Its totient is φ = 63398837580.

The previous prime is 64211643259. The next prime is 64211643299. The reversal of 64211643269 is 96234611246.

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 a cyclic number.

It is not a de Polignac number, because 64211643269 - 2⁴ = 64211643253 is a prime.

It is a super-2 number, since 2×64211643269² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64211643259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406402727 + ... + 406402884.

It is an arithmetic number, because the mean of its divisors is an integer number (16256112240).

Almost surely, 2^64211643269 is an apocalyptic number.

It is an amenable number.

64211643269 is a deficient number, since it is larger than the sum of its proper divisors (812805691).

64211643269 is an equidigital number, since it uses as much as digits as its factorization.

64211643269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812805690.

The product of its digits is 373248, while the sum is 44.

The spelling of 64211643269 in words is "sixty-four billion, two hundred eleven million, six hundred forty-three thousand, two hundred sixty-nine".