66774353 has 2 divisors, whose sum is σ = 66774354. Its totient is φ = 66774352.

The previous prime is 66774347. The next prime is 66774361. The reversal of 66774353 is 35347766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36820624 + 29953729 = 6068^2 + 5473^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66774353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66774353.

It is not a weakly prime, because it can be changed into another prime (66774553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387176 + 33387177.

It is an arithmetic number, because the mean of its divisors is an integer number (33387177).

Almost surely, 2^66774353 is an apocalyptic number.

It is an amenable number.

66774353 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774353 is an equidigital number, since it uses as much as digits as its factorization.

66774353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 41.

The square root of 66774353 is about 8171.5575626682. The cubic root of 66774353 is about 405.6983389352.

The spelling of 66774353 in words is "sixty-six million, seven hundred seventy-four thousand, three hundred fifty-three".