81298470677 has 8 divisors (see below), whose sum is σ = 87704899416. Its totient is φ = 75072504832.

The previous prime is 81298470647. The next prime is 81298470769. The reversal of 81298470677 is 77607489218.

It can be written as a sum of positive squares in 4 ways, for example, as 9937896721 + 71360573956 = 99689^2 + 267134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81298470677 - 2¹⁰ = 81298469653 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 (81298470647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45114788 + ... + 45116589.

It is an arithmetic number, because the mean of its divisors is an integer number (10963112427).

Almost surely, 2^81298470677 is an apocalyptic number.

It is an amenable number.

81298470677 is a deficient number, since it is larger than the sum of its proper divisors (6406428739).

81298470677 is a wasteful number, since it uses less digits than its factorization.

81298470677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90231447.

The product of its (nonzero) digits is 9483264, while the sum is 59.

The spelling of 81298470677 in words is "eighty-one billion, two hundred ninety-eight million, four hundred seventy thousand, six hundred seventy-seven".