66562231 has 2 divisors, whose sum is σ = 66562232. Its totient is φ = 66562230.

The previous prime is 66562219. The next prime is 66562247. The reversal of 66562231 is 13226566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66562231 - 2¹³ = 66554039 is a prime.

It is a super-2 number, since 2×66562231² = 8861061191394722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66562193 and 66562202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66562201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281115 + 33281116.

It is an arithmetic number, because the mean of its divisors is an integer number (33281116).

Almost surely, 2^66562231 is an apocalyptic number.

66562231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66562231 is an equidigital number, since it uses as much as digits as its factorization.

66562231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 66562231 is about 8158.5679503207. The cubic root of 66562231 is about 405.2682894395.

Adding to 66562231 its reverse (13226566), we get a palindrome (79788797).

The spelling of 66562231 in words is "sixty-six million, five hundred sixty-two thousand, two hundred thirty-one".