81675697599 has 32 divisors (see below), whose sum is σ = 121753748160. Its totient is φ = 54112333824.

The previous prime is 81675697591. The next prime is 81675697603. The reversal of 81675697599 is 99579657618.

81675697599 is a `hidden beast` number, since 8 + 1 + 6 + 7 + 569 + 7 + 59 + 9 = 666.

It is not a de Polignac number, because 81675697599 - 2³ = 81675697591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675697591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5375377 + ... + 5390549.

It is an arithmetic number, because the mean of its divisors is an integer number (3804804630).

Almost surely, 2^81675697599 is an apocalyptic number.

81675697599 is a deficient number, since it is larger than the sum of its proper divisors (40078050561).

81675697599 is a wasteful number, since it uses less digits than its factorization.

81675697599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16408 (or 16402 counting only the distinct ones).

The product of its digits is 257191200, while the sum is 72.

The spelling of 81675697599 in words is "eighty-one billion, six hundred seventy-five million, six hundred ninety-seven thousand, five hundred ninety-nine".