81634276533 has 32 divisors (see below), whose sum is σ = 114549129216. Its totient is φ = 51612156288.

The previous prime is 81634276519. The next prime is 81634276561. The reversal of 81634276533 is 33567243618.

It is not a de Polignac number, because 81634276533 - 2⁴ = 81634276517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81634275533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21669016 + ... + 21672782.

It is an arithmetic number, because the mean of its divisors is an integer number (3579660288).

Almost surely, 2^81634276533 is an apocalyptic number.

It is an amenable number.

81634276533 is a deficient number, since it is larger than the sum of its proper divisors (32914852683).

81634276533 is a wasteful number, since it uses less digits than its factorization.

81634276533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393.

The product of its digits is 2177280, while the sum is 48.

The spelling of 81634276533 in words is "eighty-one billion, six hundred thirty-four million, two hundred seventy-six thousand, five hundred thirty-three".