66854453 has 2 divisors, whose sum is σ = 66854454. Its totient is φ = 66854452.

The previous prime is 66854443. The next prime is 66854467. The reversal of 66854453 is 35445866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57866449 + 8988004 = 7607^2 + 2998^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66854453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66854453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66854423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427226 + 33427227.

It is an arithmetic number, because the mean of its divisors is an integer number (33427227).

Almost surely, 2^66854453 is an apocalyptic number.

It is an amenable number.

66854453 is a deficient number, since it is larger than the sum of its proper divisors (1).

66854453 is an equidigital number, since it uses as much as digits as its factorization.

66854453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 41.

The square root of 66854453 is about 8176.4572401499. The cubic root of 66854453 is about 405.8604942654.

The spelling of 66854453 in words is "sixty-six million, eight hundred fifty-four thousand, four hundred fifty-three".