18116581641 has 8 divisors (see below), whose sum is σ = 25576350624. Its totient is φ = 11367266880.

The previous prime is 18116581627. The next prime is 18116581663. The reversal of 18116581641 is 14618561181.

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

It is not a de Polignac number, because 18116581641 - 2⁹ = 18116581129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18116581593 and 18116581602.

It is not an unprimeable number, because it can be changed into a prime (18116581141) 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, 177613495 + ... + 177613596.

It is an arithmetic number, because the mean of its divisors is an integer number (3197043828).

Almost surely, 2^18116581641 is an apocalyptic number.

It is an amenable number.

18116581641 is a deficient number, since it is larger than the sum of its proper divisors (7459768983).

18116581641 is a wasteful number, since it uses less digits than its factorization.

18116581641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355227111.

The product of its digits is 46080, while the sum is 42.

The spelling of 18116581641 in words is "eighteen billion, one hundred sixteen million, five hundred eighty-one thousand, six hundred forty-one".