66144959 has 4 divisors (see below), whose sum is σ = 67266120. Its totient is φ = 65023800.

The previous prime is 66144929. The next prime is 66144961. The reversal of 66144959 is 95944166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95944166 = 2 ⋅47972083.

It is a cyclic number.

It is not a de Polignac number, because 66144959 - 2⁸ = 66144703 is a prime.

It is a super-2 number, since 2×66144959² = 8750311202223362, which 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 (66144929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560492 + ... + 560609.

It is an arithmetic number, because the mean of its divisors is an integer number (16816530).

Almost surely, 2^66144959 is an apocalyptic number.

66144959 is a deficient number, since it is larger than the sum of its proper divisors (1121161).

66144959 is a wasteful number, since it uses less digits than its factorization.

66144959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121160.

The product of its digits is 233280, while the sum is 44.

The square root of 66144959 is about 8132.9551209877. The cubic root of 66144959 is about 404.4196514313.

The spelling of 66144959 in words is "sixty-six million, one hundred forty-four thousand, nine hundred fifty-nine".