664614138443 has 4 divisors (see below), whose sum is σ = 699593829960. Its totient is φ = 629634446928.

The previous prime is 664614138437. The next prime is 664614138479. The reversal of 664614138443 is 344831416466.

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 664614138443 - 2⁴ = 664614138427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664614138391 and 664614138400.

It is not an unprimeable number, because it can be changed into a prime (664614138143) 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, 17489845730 + ... + 17489845767.

It is an arithmetic number, because the mean of its divisors is an integer number (174898457490).

Almost surely, 2^664614138443 is an apocalyptic number.

664614138443 is a deficient number, since it is larger than the sum of its proper divisors (34979691517).

664614138443 is a wasteful number, since it uses less digits than its factorization.

664614138443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34979691516.

The product of its digits is 3981312, while the sum is 50.

The spelling of 664614138443 in words is "six hundred sixty-four billion, six hundred fourteen million, one hundred thirty-eight thousand, four hundred forty-three".