545181983681 has 4 divisors (see below), whose sum is σ = 545185282992. Its totient is φ = 545178684372.

The previous prime is 545181983657. The next prime is 545181983713. The reversal of 545181983681 is 186389181545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 545181983681 - 2⁶ = 545181983617 is a prime.

It is a super-2 number, since 2×545181983681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545181983681.

It is not an unprimeable number, because it can be changed into a prime (545181983651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387955 + ... + 1736888.

It is an arithmetic number, because the mean of its divisors is an integer number (136296320748).

Almost surely, 2^545181983681 is an apocalyptic number.

It is an amenable number.

545181983681 is a deficient number, since it is larger than the sum of its proper divisors (3299311).

545181983681 is a wasteful number, since it uses less digits than its factorization.

545181983681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299310.

The product of its digits is 8294400, while the sum is 59.

The spelling of 545181983681 in words is "five hundred forty-five billion, one hundred eighty-one million, nine hundred eighty-three thousand, six hundred eighty-one".