55161661 has 4 divisors (see below), whose sum is σ = 55178524. Its totient is φ = 55144800.

The previous prime is 55161653. The next prime is 55161677. The reversal of 55161661 is 16616155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40576900 + 14584761 = 6370^2 + 3819^2 .

It is a cyclic number.

It is not a de Polignac number, because 55161661 - 2³ = 55161653 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 (55161641) 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, 1770 + ... + 10651.

It is an arithmetic number, because the mean of its divisors is an integer number (13794631).

Almost surely, 2^55161661 is an apocalyptic number.

It is an amenable number.

55161661 is a deficient number, since it is larger than the sum of its proper divisors (16863).

55161661 is a wasteful number, since it uses less digits than its factorization.

55161661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16862.

The product of its digits is 5400, while the sum is 31.

The square root of 55161661 is about 7427.0896722741. The cubic root of 55161661 is about 380.6674810649.

The spelling of 55161661 in words is "fifty-five million, one hundred sixty-one thousand, six hundred sixty-one".