55122661 has 4 divisors (see below), whose sum is σ = 60133824. Its totient is φ = 50111500.

The previous prime is 55122659. The next prime is 55122671. The reversal of 55122661 is 16622155.

55122661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55122661 - 2¹ = 55122659 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 (55122601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2505565 + ... + 2505586.

It is an arithmetic number, because the mean of its divisors is an integer number (15033456).

Almost surely, 2^55122661 is an apocalyptic number.

It is an amenable number.

55122661 is a deficient number, since it is larger than the sum of its proper divisors (5011163).

55122661 is a wasteful number, since it uses less digits than its factorization.

55122661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011162.

The product of its digits is 3600, while the sum is 28.

The square root of 55122661 is about 7424.4636843344. The cubic root of 55122661 is about 380.5777476544.

The spelling of 55122661 in words is "fifty-five million, one hundred twenty-two thousand, six hundred sixty-one".