81208248211 has 4 divisors (see below), whose sum is σ = 82236200800. Its totient is φ = 80180295624.

The previous prime is 81208248197. The next prime is 81208248229. The reversal of 81208248211 is 11284280218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81208248211 - 2⁷ = 81208248083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81208288211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513976176 + ... + 513976333.

It is an arithmetic number, because the mean of its divisors is an integer number (20559050200).

Almost surely, 2^81208248211 is an apocalyptic number.

81208248211 is a deficient number, since it is larger than the sum of its proper divisors (1027952589).

81208248211 is a wasteful number, since it uses less digits than its factorization.

81208248211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027952588.

The product of its (nonzero) digits is 16384, while the sum is 37.

The spelling of 81208248211 in words is "eighty-one billion, two hundred eight million, two hundred forty-eight thousand, two hundred eleven".