2001156256223 has 2 divisors, whose sum is σ = 2001156256224. Its totient is φ = 2001156256222.

The previous prime is 2001156256213. The next prime is 2001156256243. The reversal of 2001156256223 is 3226526511002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001156256223 - 2²⁰ = 2001155207647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001156256213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000578128111 + 1000578128112.

It is an arithmetic number, because the mean of its divisors is an integer number (1000578128112).

Almost surely, 2^{2001156256223} is an apocalyptic number.

2001156256223 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001156256223 is an equidigital number, since it uses as much as digits as its factorization.

2001156256223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 2001156256223 in words is "two trillion, one billion, one hundred fifty-six million, two hundred fifty-six thousand, two hundred twenty-three".