2105620665679 has 2 divisors, whose sum is σ = 2105620665680. Its totient is φ = 2105620665678.

The previous prime is 2105620665521. The next prime is 2105620665683. The reversal of 2105620665679 is 9765660265012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2105620665679 - 2²¹ = 2105618568527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2105620665079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052810332839 + 1052810332840.

It is an arithmetic number, because the mean of its divisors is an integer number (1052810332840).

Almost surely, 2^{2105620665679} is an apocalyptic number.

2105620665679 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105620665679 is an equidigital number, since it uses as much as digits as its factorization.

2105620665679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 2105620665679 in words is "two trillion, one hundred five billion, six hundred twenty million, six hundred sixty-five thousand, six hundred seventy-nine".