66231049 has 2 divisors, whose sum is σ = 66231050. Its totient is φ = 66231048.

The previous prime is 66231047. The next prime is 66231059. The reversal of 66231049 is 94013266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60140025 + 6091024 = 7755^2 + 2468^2 .

It is a cyclic number.

It is not a de Polignac number, because 66231049 - 2¹ = 66231047 is a prime.

Together with 66231047, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66231049.

It is not a weakly prime, because it can be changed into another prime (66231043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33115524 + 33115525.

It is an arithmetic number, because the mean of its divisors is an integer number (33115525).

Almost surely, 2^66231049 is an apocalyptic number.

It is an amenable number.

66231049 is a deficient number, since it is larger than the sum of its proper divisors (1).

66231049 is an equidigital number, since it uses as much as digits as its factorization.

66231049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66231049 is about 8138.2460641099. The cubic root of 66231049 is about 404.5950308518.

The spelling of 66231049 in words is "sixty-six million, two hundred thirty-one thousand, forty-nine".