2211665203613 has 2 divisors, whose sum is σ = 2211665203614. Its totient is φ = 2211665203612.

The previous prime is 2211665203577. The next prime is 2211665203619. The reversal of 2211665203613 is 3163025661122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1398831329284 + 812833874329 = 1182722^2 + 901573^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211665203613 - 2²⁰ = 2211664155037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211665203619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105832601806 + 1105832601807.

It is an arithmetic number, because the mean of its divisors is an integer number (1105832601807).

Almost surely, 2^{2211665203613} is an apocalyptic number.

It is an amenable number.

2211665203613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211665203613 is an equidigital number, since it uses as much as digits as its factorization.

2211665203613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 2211665203613 in words is "two trillion, two hundred eleven billion, six hundred sixty-five million, two hundred three thousand, six hundred thirteen".