662868649 has 2 divisors, whose sum is σ = 662868650. Its totient is φ = 662868648.

The previous prime is 662868643. The next prime is 662868781. The reversal of 662868649 is 946868266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649230400 + 13638249 = 25480^2 + 3693^2 .

It is a cyclic number.

It is not a de Polignac number, because 662868649 - 2⁵ = 662868617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 662868649.

It is not a weakly prime, because it can be changed into another prime (662868643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331434324 + 331434325.

It is an arithmetic number, because the mean of its divisors is an integer number (331434325).

Almost surely, 2^662868649 is an apocalyptic number.

It is an amenable number.

662868649 is a deficient number, since it is larger than the sum of its proper divisors (1).

662868649 is an equidigital number, since it uses as much as digits as its factorization.

662868649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 55.

The square root of 662868649 is about 25746.2356277573. The cubic root of 662868649 is about 871.9183673722.

The spelling of 662868649 in words is "six hundred sixty-two million, eight hundred sixty-eight thousand, six hundred forty-nine".