662722561 has 4 divisors (see below), whose sum is σ = 663150852. Its totient is φ = 662294272.

The previous prime is 662722549. The next prime is 662722589. The reversal of 662722561 is 165227266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178062336 + 484660225 = 13344^2 + 22015^2 .

It is a cyclic number.

It is not a de Polignac number, because 662722561 - 2¹³ = 662714369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 662722561.

It is not an unprimeable number, because it can be changed into a prime (662722531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211816 + ... + 214921.

It is an arithmetic number, because the mean of its divisors is an integer number (165787713).

Almost surely, 2^662722561 is an apocalyptic number.

It is an amenable number.

662722561 is a deficient number, since it is larger than the sum of its proper divisors (428291).

662722561 is a wasteful number, since it uses less digits than its factorization.

662722561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428290.

The product of its digits is 60480, while the sum is 37.

The square root of 662722561 is about 25743.3983964822. The cubic root of 662722561 is about 871.8543093474.

The spelling of 662722561 in words is "six hundred sixty-two million, seven hundred twenty-two thousand, five hundred sixty-one".