665554433 has 2 divisors, whose sum is σ = 665554434. Its totient is φ = 665554432.

The previous prime is 665554429. The next prime is 665554489. The reversal of 665554433 is 334455566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644550544 + 21003889 = 25388^2 + 4583^2 .

It is a cyclic number.

It is not a de Polignac number, because 665554433 - 2² = 665554429 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (665551433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332777216 + 332777217.

It is an arithmetic number, because the mean of its divisors is an integer number (332777217).

Almost surely, 2^665554433 is an apocalyptic number.

It is an amenable number.

665554433 is a deficient number, since it is larger than the sum of its proper divisors (1).

665554433 is an equidigital number, since it uses as much as digits as its factorization.

665554433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 41.

The square root of 665554433 is about 25798.3416715106. The cubic root of 665554433 is about 873.0943815152.

The spelling of 665554433 in words is "six hundred sixty-five million, five hundred fifty-four thousand, four hundred thirty-three".