66722 has 8 divisors (see below), whose sum is σ = 101676. Its totient is φ = 32832.

The previous prime is 66721. The next prime is 66733. The reversal of 66722 is 22766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63001 + 3721 = 251^2 + 61^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83 + ... + 374.

2⁶⁶⁷²² is an apocalyptic number.

66722 is a deficient number, since it is larger than the sum of its proper divisors (34954).

66722 is a wasteful number, since it uses less digits than its factorization.

66722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532.

The product of its digits is 1008, while the sum is 23.

The square root of 66722 is about 258.3060200615. The cubic root of 66722 is about 40.5592284852.

Subtracting from 66722 its reverse (22766), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 66722 in words is "sixty-six thousand, seven hundred twenty-two".