66261 has 8 divisors (see below), whose sum is σ = 95200. Its totient is φ = 40752.

The previous prime is 66239. The next prime is 66271. The reversal of 66261 is 16266.

66261 = T₅₈ + T₅₉ + ... + T₈₃.

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

It is not a de Polignac number, because 66261 - 2¹⁴ = 49877 is a prime.

It is a Duffinian number.

It is a Curzon number.

66261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811 + ... + 888.

It is an arithmetic number, because the mean of its divisors is an integer number (11900).

2⁶⁶²⁶¹ is an apocalyptic number.

It is an amenable number.

66261 is a deficient number, since it is larger than the sum of its proper divisors (28939).

66261 is a wasteful number, since it uses less digits than its factorization.

66261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715.

The product of its digits is 432, while the sum is 21.

The square root of 66261 is about 257.4121209267. The cubic root of 66261 is about 40.4656010305.

The spelling of 66261 in words is "sixty-six thousand, two hundred sixty-one".