66722153 has 2 divisors, whose sum is σ = 66722154. Its totient is φ = 66722152.

The previous prime is 66722147. The next prime is 66722171. The reversal of 66722153 is 35122766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66716224 + 5929 = 8168^2 + 77^2 .

It is a cyclic number.

It is not a de Polignac number, because 66722153 - 2²⁰ = 65673577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66722353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33361076 + 33361077.

It is an arithmetic number, because the mean of its divisors is an integer number (33361077).

Almost surely, 2^66722153 is an apocalyptic number.

It is an amenable number.

66722153 is a deficient number, since it is larger than the sum of its proper divisors (1).

66722153 is an equidigital number, since it uses as much as digits as its factorization.

66722153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 66722153 is about 8168.3629326812. The cubic root of 66722153 is about 405.5925948726.

The spelling of 66722153 in words is "sixty-six million, seven hundred twenty-two thousand, one hundred fifty-three".