66397453 has 2 divisors, whose sum is σ = 66397454. Its totient is φ = 66397452.

The previous prime is 66397451. The next prime is 66397531. The reversal of 66397453 is 35479366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49603849 + 16793604 = 7043^2 + 4098^2 .

It is a cyclic number.

It is not a de Polignac number, because 66397453 - 2¹ = 66397451 is a prime.

Together with 66397451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66397451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33198726 + 33198727.

It is an arithmetic number, because the mean of its divisors is an integer number (33198727).

Almost surely, 2^66397453 is an apocalyptic number.

It is an amenable number.

66397453 is a deficient number, since it is larger than the sum of its proper divisors (1).

66397453 is an equidigital number, since it uses as much as digits as its factorization.

66397453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 43.

The square root of 66397453 is about 8148.4632293458. The cubic root of 66397453 is about 404.9335927292.

The spelling of 66397453 in words is "sixty-six million, three hundred ninety-seven thousand, four hundred fifty-three".