664614143 has 4 divisors (see below), whose sum is σ = 664765608. Its totient is φ = 664462680.

The previous prime is 664614113. The next prime is 664614151. The reversal of 664614143 is 341416466.

It is a happy number.

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 664614143 - 2¹⁰ = 664613119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664614103) 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, 68948 + ... + 77993.

It is an arithmetic number, because the mean of its divisors is an integer number (166191402).

Almost surely, 2^664614143 is an apocalyptic number.

664614143 is a deficient number, since it is larger than the sum of its proper divisors (151465).

664614143 is a wasteful number, since it uses less digits than its factorization.

664614143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151464.

The product of its digits is 41472, while the sum is 35.

The square root of 664614143 is about 25780.1113845538. Note that the first 3 decimals coincide. The cubic root of 664614143 is about 872.6830208034.

The spelling of 664614143 in words is "six hundred sixty-four million, six hundred fourteen thousand, one hundred forty-three".