81275898613 has 24 divisors (see below), whose sum is σ = 102479344128. Its totient is φ = 63092832192.

The previous prime is 81275898581. The next prime is 81275898623. The reversal of 81275898613 is 31689857218.

It is not a de Polignac number, because 81275898613 - 2⁵ = 81275898581 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81275898623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 585445 + ... + 710842.

It is an arithmetic number, because the mean of its divisors is an integer number (4269972672).

Almost surely, 2^81275898613 is an apocalyptic number.

It is an amenable number.

81275898613 is a deficient number, since it is larger than the sum of its proper divisors (21203445515).

81275898613 is a wasteful number, since it uses less digits than its factorization.

81275898613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296373 (or 1296360 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 58.

The spelling of 81275898613 in words is "eighty-one billion, two hundred seventy-five million, eight hundred ninety-eight thousand, six hundred thirteen".