2405706661 has 2 divisors, whose sum is σ = 2405706662. Its totient is φ = 2405706660.

The previous prime is 2405706659. The next prime is 2405706683. The reversal of 2405706661 is 1666075042.

It is a happy number.

2405706661 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., 1625621761 + 780084900 = 40319^2 + 27930^2 .

It is a cyclic number.

It is not a de Polignac number, because 2405706661 - 2¹ = 2405706659 is a prime.

Together with 2405706659, 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 2405706661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2405706631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1202853330 + 1202853331.

It is an arithmetic number, because the mean of its divisors is an integer number (1202853331).

Almost surely, 2^2405706661 is an apocalyptic number.

It is an amenable number.

2405706661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2405706661 is an equidigital number, since it uses as much as digits as its factorization.

2405706661 is an evil number, because the sum of its binary digits is even.

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

The square root of 2405706661 is about 49048.0036392920. The cubic root of 2405706661 is about 1339.9262343369.

The spelling of 2405706661 in words is "two billion, four hundred five million, seven hundred six thousand, six hundred sixty-one".