81794790502211 has 2 divisors, whose sum is σ = 81794790502212. Its totient is φ = 81794790502210.

The previous prime is 81794790502189. The next prime is 81794790502241. The reversal of 81794790502211 is 11220509749718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81794790502211 - 2¹⁰ = 81794790501187 is a prime.

It is not a weakly prime, because it can be changed into another prime (81794790502241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40897395251105 + 40897395251106.

It is an arithmetic number, because the mean of its divisors is an integer number (40897395251106).

Almost surely, 2^{81794790502211} is an apocalyptic number.

81794790502211 is a deficient number, since it is larger than the sum of its proper divisors (1).

81794790502211 is an equidigital number, since it uses as much as digits as its factorization.

81794790502211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The spelling of 81794790502211 in words is "eighty-one trillion, seven hundred ninety-four billion, seven hundred ninety million, five hundred two thousand, two hundred eleven".