66023261 has 2 divisors, whose sum is σ = 66023262. Its totient is φ = 66023260.

The previous prime is 66023249. The next prime is 66023267. The reversal of 66023261 is 16232066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64080025 + 1943236 = 8005^2 + 1394^2 .

It is a cyclic number.

It is not a de Polignac number, because 66023261 - 2⁶ = 66023197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66023261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66023267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33011630 + 33011631.

It is an arithmetic number, because the mean of its divisors is an integer number (33011631).

Almost surely, 2^66023261 is an apocalyptic number.

It is an amenable number.

66023261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66023261 is an equidigital number, since it uses as much as digits as its factorization.

66023261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66023261 is about 8125.4698941046. The cubic root of 66023261 is about 404.1714728919.

The spelling of 66023261 in words is "sixty-six million, twenty-three thousand, two hundred sixty-one".