2105626661 has 2 divisors, whose sum is σ = 2105626662. Its totient is φ = 2105626660.

The previous prime is 2105626657. The next prime is 2105626687. The reversal of 2105626661 is 1666265012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1563016225 + 542610436 = 39535^2 + 23294^2 .

It is a cyclic number.

It is not a de Polignac number, because 2105626661 - 2² = 2105626657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105626651) 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, 1052813330 + 1052813331.

It is an arithmetic number, because the mean of its divisors is an integer number (1052813331).

Almost surely, 2^2105626661 is an apocalyptic number.

It is an amenable number.

2105626661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105626661 is an equidigital number, since it uses as much as digits as its factorization.

2105626661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 2105626661 is about 45887.1077863925. The cubic root of 2105626661 is about 1281.7218569126.

The spelling of 2105626661 in words is "two billion, one hundred five million, six hundred twenty-six thousand, six hundred sixty-one".