550440525661 has 4 divisors (see below), whose sum is σ = 592782104572. Its totient is φ = 508098946752.

The previous prime is 550440525617. The next prime is 550440525673. The reversal of 550440525661 is 166525044055.

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

It can be written as a sum of positive squares in 2 ways, for example, as 208442468025 + 341998057636 = 456555^2 + 584806^2 .

It is a cyclic number.

It is not a de Polignac number, because 550440525661 - 2¹⁵ = 550440492893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550440525161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21170789436 + ... + 21170789461.

It is an arithmetic number, because the mean of its divisors is an integer number (148195526143).

Almost surely, 2^550440525661 is an apocalyptic number.

It is an amenable number.

550440525661 is a deficient number, since it is larger than the sum of its proper divisors (42341578911).

550440525661 is a wasteful number, since it uses less digits than its factorization.

550440525661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42341578910.

The product of its (nonzero) digits is 720000, while the sum is 43.

The spelling of 550440525661 in words is "five hundred fifty billion, four hundred forty million, five hundred twenty-five thousand, six hundred sixty-one".