66922231 has 2 divisors, whose sum is σ = 66922232. Its totient is φ = 66922230.

The previous prime is 66922201. The next prime is 66922253. The reversal of 66922231 is 13222966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66922231 - 2⁹ = 66921719 is a prime.

It is a super-2 number, since 2×66922231² = 8957170004034722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66922193 and 66922202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66922201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33461115 + 33461116.

It is an arithmetic number, because the mean of its divisors is an integer number (33461116).

Almost surely, 2^66922231 is an apocalyptic number.

66922231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66922231 is an equidigital number, since it uses as much as digits as its factorization.

66922231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 66922231 is about 8180.6008947998. The cubic root of 66922231 is about 405.9976036647.

The spelling of 66922231 in words is "sixty-six million, nine hundred twenty-two thousand, two hundred thirty-one".