81636374823219 has 40 divisors (see below), whose sum is σ = 122099607131040. Its totient is φ = 54357777644544.

The previous prime is 81636374823173. The next prime is 81636374823229. The reversal of 81636374823219 is 91232847363618.

It is a happy number.

81636374823219 is a `hidden beast` number, since 8 + 1 + 63 + 63 + 7 + 482 + 32 + 1 + 9 = 666.

It is not a de Polignac number, because 81636374823219 - 2¹³ = 81636374815027 is a prime.

It is a super-2 number, since 2×81636374823219² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81636374823229) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 859889277 + ... + 859984209.

It is an arithmetic number, because the mean of its divisors is an integer number (3052490178276).

Almost surely, 2^{81636374823219} is an apocalyptic number.

81636374823219 is a deficient number, since it is larger than the sum of its proper divisors (40463232307821).

81636374823219 is a wasteful number, since it uses less digits than its factorization.

81636374823219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107801 (or 107792 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 81636374823219 in words is "eighty-one trillion, six hundred thirty-six billion, three hundred seventy-four million, eight hundred twenty-three thousand, two hundred nineteen".