549990643691 has 4 divisors (see below), whose sum is σ = 550162357992. Its totient is φ = 549818929392.

The previous prime is 549990643687. The next prime is 549990643693. The reversal of 549990643691 is 196346099945.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 549990643691 - 2² = 549990643687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549990643693) 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, 85852346 + ... + 85858751.

It is an arithmetic number, because the mean of its divisors is an integer number (137540589498).

Almost surely, 2^549990643691 is an apocalyptic number.

549990643691 is a deficient number, since it is larger than the sum of its proper divisors (171714301).

549990643691 is a wasteful number, since it uses less digits than its factorization.

549990643691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171714300.

The product of its (nonzero) digits is 56687040, while the sum is 65.

The spelling of 549990643691 in words is "five hundred forty-nine billion, nine hundred ninety million, six hundred forty-three thousand, six hundred ninety-one".