662039561 has 2 divisors, whose sum is σ = 662039562. Its totient is φ = 662039560.

The previous prime is 662039519. The next prime is 662039563. The reversal of 662039561 is 165930266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610831225 + 51208336 = 24715^2 + 7156^2 .

It is a cyclic number.

It is not a de Polignac number, because 662039561 - 2²² = 657845257 is a prime.

It is a Sophie Germain prime.

Together with 662039563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (662039563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331019780 + 331019781.

It is an arithmetic number, because the mean of its divisors is an integer number (331019781).

Almost surely, 2^662039561 is an apocalyptic number.

It is an amenable number.

662039561 is a deficient number, since it is larger than the sum of its proper divisors (1).

662039561 is an equidigital number, since it uses as much as digits as its factorization.

662039561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 662039561 is about 25730.1294400164. The cubic root of 662039561 is about 871.5546962006.

The spelling of 662039561 in words is "six hundred sixty-two million, thirty-nine thousand, five hundred sixty-one".