662356561 has 2 divisors, whose sum is σ = 662356562. Its totient is φ = 662356560.

The previous prime is 662356559. The next prime is 662356589. The reversal of 662356561 is 165653266.

It is a happy number.

662356561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365001025 + 297355536 = 19105^2 + 17244^2 .

It is a cyclic number.

It is not a de Polignac number, because 662356561 - 2¹ = 662356559 is a prime.

Together with 662356559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (662356661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331178280 + 331178281.

It is an arithmetic number, because the mean of its divisors is an integer number (331178281).

Almost surely, 2^662356561 is an apocalyptic number.

It is an amenable number.

662356561 is a deficient number, since it is larger than the sum of its proper divisors (1).

662356561 is an equidigital number, since it uses as much as digits as its factorization.

662356561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 40.

The square root of 662356561 is about 25736.2887961726. The cubic root of 662356561 is about 871.6937809169.

The spelling of 662356561 in words is "six hundred sixty-two million, three hundred fifty-six thousand, five hundred sixty-one".