66202139 has 4 divisors (see below), whose sum is σ = 67991424. Its totient is φ = 64412856.

The previous prime is 66202133. The next prime is 66202153. The reversal of 66202139 is 93120266.

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

It is a de Polignac number, because none of the positive numbers 2^k-66202139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66202133) 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, 894587 + ... + 894660.

It is an arithmetic number, because the mean of its divisors is an integer number (16997856).

Almost surely, 2^66202139 is an apocalyptic number.

66202139 is a deficient number, since it is larger than the sum of its proper divisors (1789285).

66202139 is a wasteful number, since it uses less digits than its factorization.

66202139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789284.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66202139 is about 8136.4696889990. The cubic root of 66202139 is about 404.5361534077.

The spelling of 66202139 in words is "sixty-six million, two hundred two thousand, one hundred thirty-nine".