2011661705423 has 2 divisors, whose sum is σ = 2011661705424. Its totient is φ = 2011661705422.

The previous prime is 2011661705419. The next prime is 2011661705429. The reversal of 2011661705423 is 3245071661102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2011661705423 - 2² = 2011661705419 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011661705429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005830852711 + 1005830852712.

It is an arithmetic number, because the mean of its divisors is an integer number (1005830852712).

Almost surely, 2^{2011661705423} is an apocalyptic number.

2011661705423 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011661705423 is an equidigital number, since it uses as much as digits as its factorization.

2011661705423 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 38.

The spelling of 2011661705423 in words is "two trillion, eleven billion, six hundred sixty-one million, seven hundred five thousand, four hundred twenty-three".