81322675287 has 16 divisors (see below), whose sum is σ = 125488880640. Its totient is φ = 45881870112.

The previous prime is 81322675267. The next prime is 81322675361. The reversal of 81322675287 is 78257622318.

It is not a de Polignac number, because 81322675287 - 2⁶ = 81322675223 is a prime.

It is a super-2 number, since 2×81322675287² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81322675267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24507888 + ... + 24511205.

It is an arithmetic number, because the mean of its divisors is an integer number (7843055040).

Almost surely, 2^81322675287 is an apocalyptic number.

81322675287 is a deficient number, since it is larger than the sum of its proper divisors (44166205353).

81322675287 is a wasteful number, since it uses less digits than its factorization.

81322675287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49019182.

The product of its digits is 2257920, while the sum is 51.

The spelling of 81322675287 in words is "eighty-one billion, three hundred twenty-two million, six hundred seventy-five thousand, two hundred eighty-seven".