66206261 has 8 divisors (see below), whose sum is σ = 72322848. Its totient is φ = 60106000.

The previous prime is 66206233. The next prime is 66206263. The reversal of 66206261 is 16260266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66206261 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 (66206263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5366 + ... + 12696.

It is an arithmetic number, because the mean of its divisors is an integer number (9040356).

Almost surely, 2^66206261 is an apocalyptic number.

It is an amenable number.

66206261 is a deficient number, since it is larger than the sum of its proper divisors (6116587).

66206261 is a wasteful number, since it uses less digits than its factorization.

66206261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8163.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 66206261 is about 8136.7229890171. The cubic root of 66206261 is about 404.5445492261.

The spelling of 66206261 in words is "sixty-six million, two hundred six thousand, two hundred sixty-one".