55066550681 has 8 divisors (see below), whose sum is σ = 55129674600. Its totient is φ = 55003463680.

The previous prime is 55066550647. The next prime is 55066550689. The reversal of 55066550681 is 18605566055.

It can be written as a sum of positive squares in 4 ways, for example, as 10621081 + 55055929600 = 3259^2 + 234640^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55066550681 is a prime.

It is a super-2 number, since 2×55066550681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55066550689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3838001 + ... + 3852321.

It is an arithmetic number, because the mean of its divisors is an integer number (6891209325).

Almost surely, 2^55066550681 is an apocalyptic number.

It is an amenable number.

55066550681 is a deficient number, since it is larger than the sum of its proper divisors (63123919).

55066550681 is a wasteful number, since it uses less digits than its factorization.

55066550681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18459.

The product of its (nonzero) digits is 1080000, while the sum is 47.

The spelling of 55066550681 in words is "fifty-five billion, sixty-six million, five hundred fifty thousand, six hundred eighty-one".