81589086634815 has 12 divisors (see below), whose sum is σ = 141421083500424. Its totient is φ = 43514179538544.

The previous prime is 81589086634799. The next prime is 81589086634817. The reversal of 81589086634815 is 51843668098518.

81589086634815 is a `hidden beast` number, since 8 + 1 + 5 + 8 + 9 + 0 + 86 + 63 + 481 + 5 = 666.

It is not a de Polignac number, because 81589086634815 - 2⁴ = 81589086634799 is a prime.

It is a super-2 number, since 2×81589086634815² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81589086634817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 906545407009 + ... + 906545407098.

It is an arithmetic number, because the mean of its divisors is an integer number (11785090291702).

Almost surely, 2^{81589086634815} is an apocalyptic number.

81589086634815 is a deficient number, since it is larger than the sum of its proper divisors (59831996865609).

81589086634815 is a wasteful number, since it uses less digits than its factorization.

81589086634815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813090814118 (or 1813090814115 counting only the distinct ones).

The product of its (nonzero) digits is 398131200, while the sum is 72.

The spelling of 81589086634815 in words is "eighty-one trillion, five hundred eighty-nine billion, eighty-six million, six hundred thirty-four thousand, eight hundred fifteen".