66351413 has 2 divisors, whose sum is σ = 66351414. Its totient is φ = 66351412.

The previous prime is 66351409. The next prime is 66351431. The reversal of 66351413 is 31415366.

It is a happy number.

Together with next prime (66351431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50367409 + 15984004 = 7097^2 + 3998^2 .

It is a cyclic number.

It is not a de Polignac number, because 66351413 - 2² = 66351409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66351433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33175706 + 33175707.

It is an arithmetic number, because the mean of its divisors is an integer number (33175707).

Almost surely, 2^66351413 is an apocalyptic number.

It is an amenable number.

66351413 is a deficient number, since it is larger than the sum of its proper divisors (1).

66351413 is an equidigital number, since it uses as much as digits as its factorization.

66351413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 66351413 is about 8145.6376668742. The cubic root of 66351413 is about 404.8399774248.

Adding to 66351413 its reverse (31415366), we get a palindrome (97766779).

The spelling of 66351413 in words is "sixty-six million, three hundred fifty-one thousand, four hundred thirteen".