55205661 has 16 divisors (see below), whose sum is σ = 84406784. Its totient is φ = 31439664.

The previous prime is 55205653. The next prime is 55205663. The reversal of 55205661 is 16650255.

It is not a de Polignac number, because 55205661 - 2³ = 55205653 is a prime.

It is a super-4 number, since 4×55205661⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55205663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2166 + ... + 10728.

It is an arithmetic number, because the mean of its divisors is an integer number (5275424).

Almost surely, 2^55205661 is an apocalyptic number.

It is an amenable number.

55205661 is a deficient number, since it is larger than the sum of its proper divisors (29201123).

55205661 is a wasteful number, since it uses less digits than its factorization.

55205661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 55205661 is about 7430.0512111290. The cubic root of 55205661 is about 380.7686679969.

The spelling of 55205661 in words is "fifty-five million, two hundred five thousand, six hundred sixty-one".