66023569 has 2 divisors, whose sum is σ = 66023570. Its totient is φ = 66023568.

The previous prime is 66023567. The next prime is 66023603. The reversal of 66023569 is 96532066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62995969 + 3027600 = 7937^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 66023569 - 2¹ = 66023567 is a prime.

It is a super-2 number, since 2×66023569² = 8718223326995522, which contains 22 as substring.

Together with 66023567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66023567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33011784 + 33011785.

It is an arithmetic number, because the mean of its divisors is an integer number (33011785).

Almost surely, 2^66023569 is an apocalyptic number.

It is an amenable number.

66023569 is a deficient number, since it is larger than the sum of its proper divisors (1).

66023569 is an equidigital number, since it uses as much as digits as its factorization.

66023569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 66023569 is about 8125.4888468325. The cubic root of 66023569 is about 404.1721013806.

The spelling of 66023569 in words is "sixty-six million, twenty-three thousand, five hundred sixty-nine".