82781117322311 has 4 divisors (see below), whose sum is σ = 82781144208312. Its totient is φ = 82781090436312.

The previous prime is 82781117322251. The next prime is 82781117322347. The reversal of 82781117322311 is 11322371118728.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82781117322311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82781117322011) 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, 8122676 + ... + 15216441.

It is an arithmetic number, because the mean of its divisors is an integer number (20695286052078).

Almost surely, 2^{82781117322311} is an apocalyptic number.

82781117322311 is a deficient number, since it is larger than the sum of its proper divisors (26886001).

82781117322311 is a wasteful number, since it uses less digits than its factorization.

82781117322311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26886000.

The product of its digits is 225792, while the sum is 47.

The spelling of 82781117322311 in words is "eighty-two trillion, seven hundred eighty-one billion, one hundred seventeen million, three hundred twenty-two thousand, three hundred eleven".