66212453 has 2 divisors, whose sum is σ = 66212454. Its totient is φ = 66212452.

The previous prime is 66212429. The next prime is 66212459. The reversal of 66212453 is 35421266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64995844 + 1216609 = 8062^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 66212453 - 2¹² = 66208357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66212459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106226 + 33106227.

It is an arithmetic number, because the mean of its divisors is an integer number (33106227).

Almost surely, 2^66212453 is an apocalyptic number.

It is an amenable number.

66212453 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212453 is an equidigital number, since it uses as much as digits as its factorization.

66212453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 66212453 is about 8137.1034772823. The cubic root of 66212453 is about 404.5571606304.

The spelling of 66212453 in words is "sixty-six million, two hundred twelve thousand, four hundred fifty-three".