66122143 has 4 divisors (see below), whose sum is σ = 66181840. Its totient is φ = 66062448.

The previous prime is 66122137. The next prime is 66122153. The reversal of 66122143 is 34122166.

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-66122143 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66122113) 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, 28155 + ... + 30412.

It is an arithmetic number, because the mean of its divisors is an integer number (16545460).

Almost surely, 2^66122143 is an apocalyptic number.

66122143 is a deficient number, since it is larger than the sum of its proper divisors (59697).

66122143 is a wasteful number, since it uses less digits than its factorization.

66122143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59696.

The product of its digits is 1728, while the sum is 25.

The square root of 66122143 is about 8131.5523118283. The cubic root of 66122143 is about 404.3731459981.

The spelling of 66122143 in words is "sixty-six million, one hundred twenty-two thousand, one hundred forty-three".