66354413 has 2 divisors, whose sum is σ = 66354414. Its totient is φ = 66354412.

The previous prime is 66354377. The next prime is 66354427. The reversal of 66354413 is 31445366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62520649 + 3833764 = 7907^2 + 1958^2 .

It is a cyclic number.

It is not a de Polignac number, because 66354413 - 2⁸ = 66354157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66354413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66354473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33177206 + 33177207.

It is an arithmetic number, because the mean of its divisors is an integer number (33177207).

Almost surely, 2^66354413 is an apocalyptic number.

It is an amenable number.

66354413 is a deficient number, since it is larger than the sum of its proper divisors (1).

66354413 is an equidigital number, since it uses as much as digits as its factorization.

66354413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 32.

The square root of 66354413 is about 8145.8218124386. The cubic root of 66354413 is about 404.8460787851.

Adding to 66354413 its reverse (31445366), we get a palindrome (97799779).

The spelling of 66354413 in words is "sixty-six million, three hundred fifty-four thousand, four hundred thirteen".