55661222110607 has 4 divisors (see below), whose sum is σ = 55968742674936. Its totient is φ = 55353701546280.

The previous prime is 55661222110393. The next prime is 55661222110609. The reversal of 55661222110607 is 70601122216655.

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 55661222110607 - 2¹⁰ = 55661222109583 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 (55661222110609) 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, 153760281893 + ... + 153760282254.

It is an arithmetic number, because the mean of its divisors is an integer number (13992185668734).

Almost surely, 2^{55661222110607} is an apocalyptic number.

55661222110607 is a deficient number, since it is larger than the sum of its proper divisors (307520564329).

55661222110607 is a wasteful number, since it uses less digits than its factorization.

55661222110607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307520564328.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 55661222110607 in words is "fifty-five trillion, six hundred sixty-one billion, two hundred twenty-two million, one hundred ten thousand, six hundred seven".