55665561601 has 8 divisors (see below), whose sum is σ = 59970332520. Its totient is φ = 51364048512.

The previous prime is 55665561563. The next prime is 55665561641. The reversal of 55665561601 is 10616556655.

It can be written as a sum of positive squares in 4 ways, for example, as 1413835201 + 54251726400 = 37601^2 + 232920^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55665561601 - 2¹¹ = 55665559553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55665561641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778906 + ... + 847363.

It is an arithmetic number, because the mean of its divisors is an integer number (7496291565).

Almost surely, 2^55665561601 is an apocalyptic number.

It is an amenable number.

55665561601 is a deficient number, since it is larger than the sum of its proper divisors (4304770919).

55665561601 is a wasteful number, since it uses less digits than its factorization.

55665561601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628915.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 55665561601 in words is "fifty-five billion, six hundred sixty-five million, five hundred sixty-one thousand, six hundred one".