55126661 has 4 divisors (see below), whose sum is σ = 55170912. Its totient is φ = 55082412.

The previous prime is 55126637. The next prime is 55126667. The reversal of 55126661 is 16662155.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16662155 = 5 ⋅3332431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55126661 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 (55126667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20201 + ... + 22766.

It is an arithmetic number, because the mean of its divisors is an integer number (13792728).

Almost surely, 2^55126661 is an apocalyptic number.

It is an amenable number.

55126661 is a deficient number, since it is larger than the sum of its proper divisors (44251).

55126661 is a wasteful number, since it uses less digits than its factorization.

55126661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44250.

The product of its digits is 10800, while the sum is 32.

The square root of 55126661 is about 7424.7330591746. The cubic root of 55126661 is about 380.5869530286.

The spelling of 55126661 in words is "fifty-five million, one hundred twenty-six thousand, six hundred sixty-one".