81550486134489 has 8 divisors (see below), whose sum is σ = 108734351877472. Its totient is φ = 54366805573920.

The previous prime is 81550486134479. The next prime is 81550486134517. The reversal of 81550486134489 is 98443168405518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81550486134489 - 2¹⁷ = 81550486003417 is a prime.

It is a super-2 number, since 2×81550486134489² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81550486134479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45264772 + ... + 47031909.

It is an arithmetic number, because the mean of its divisors is an integer number (13591793984684).

Almost surely, 2^{81550486134489} is an apocalyptic number.

It is an amenable number.

81550486134489 is a deficient number, since it is larger than the sum of its proper divisors (27183865742983).

81550486134489 is a wasteful number, since it uses less digits than its factorization.

81550486134489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92591207.

The product of its (nonzero) digits is 132710400, while the sum is 66.

The spelling of 81550486134489 in words is "eighty-one trillion, five hundred fifty billion, four hundred eighty-six million, one hundred thirty-four thousand, four hundred eighty-nine".