64667143 has 4 divisors (see below), whose sum is σ = 64783800. Its totient is φ = 64550488.

The previous prime is 64667131. The next prime is 64667149. The reversal of 64667143 is 34176646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64667143 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 (64667149) 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, 57493 + ... + 58606.

It is an arithmetic number, because the mean of its divisors is an integer number (16195950).

Almost surely, 2^64667143 is an apocalyptic number.

64667143 is a deficient number, since it is larger than the sum of its proper divisors (116657).

64667143 is a wasteful number, since it uses less digits than its factorization.

64667143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116656.

The product of its digits is 72576, while the sum is 37.

The square root of 64667143 is about 8041.5883381332. The cubic root of 64667143 is about 401.3850796004.

The spelling of 64667143 in words is "sixty-four million, six hundred sixty-seven thousand, one hundred forty-three".