81517635467 has 4 divisors (see below), whose sum is σ = 81545076216. Its totient is φ = 81490194720.

The previous prime is 81517635461. The next prime is 81517635487. The reversal of 81517635467 is 76453671518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81517635467 - 2¹⁸ = 81517373323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81517635461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13715918 + ... + 13721859.

It is an arithmetic number, because the mean of its divisors is an integer number (20386269054).

Almost surely, 2^81517635467 is an apocalyptic number.

81517635467 is a deficient number, since it is larger than the sum of its proper divisors (27440749).

81517635467 is a wasteful number, since it uses less digits than its factorization.

81517635467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27440748.

The product of its digits is 4233600, while the sum is 53.

The spelling of 81517635467 in words is "eighty-one billion, five hundred seventeen million, six hundred thirty-five thousand, four hundred sixty-seven".