3549045813681 has 4 divisors (see below), whose sum is σ = 4732061084912. Its totient is φ = 2366030542452.

The previous prime is 3549045813659. The next prime is 3549045813707. The reversal of 3549045813681 is 1863185409453.

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 not a de Polignac number, because 3549045813681 - 2⁷ = 3549045813553 is a prime.

It is a super-2 number, since 2×3549045813681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3549045813631) 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, 591507635611 + ... + 591507635616.

It is an arithmetic number, because the mean of its divisors is an integer number (1183015271228).

Almost surely, 2^{3549045813681} is an apocalyptic number.

It is an amenable number.

3549045813681 is a deficient number, since it is larger than the sum of its proper divisors (1183015271231).

3549045813681 is a wasteful number, since it uses less digits than its factorization.

3549045813681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183015271230.

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 3549045813681 in words is "three trillion, five hundred forty-nine billion, forty-five million, eight hundred thirteen thousand, six hundred eighty-one".