87488181817 has 4 divisors (see below), whose sum is σ = 87706357236. Its totient is φ = 87270006400.

The previous prime is 87488181799. The next prime is 87488181841. The reversal of 87488181817 is 71818188478.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69687552256 + 17800629561 = 263984^2 + 133419^2 .

It is a cyclic number.

It is not a de Polignac number, because 87488181817 - 2⁷ = 87488181689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87488181857) 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, 109087108 + ... + 109087909.

It is an arithmetic number, because the mean of its divisors is an integer number (21926589309).

Almost surely, 2^87488181817 is an apocalyptic number.

It is an amenable number.

87488181817 is a deficient number, since it is larger than the sum of its proper divisors (218175419).

87488181817 is a wasteful number, since it uses less digits than its factorization.

87488181817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218175418.

The product of its digits is 6422528, while the sum is 61.

The spelling of 87488181817 in words is "eighty-seven billion, four hundred eighty-eight million, one hundred eighty-one thousand, eight hundred seventeen".