55200661 has 2 divisors, whose sum is σ = 55200662. Its totient is φ = 55200660.

The previous prime is 55200631. The next prime is 55200721. The reversal of 55200661 is 16600255.

55200661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29495761 + 25704900 = 5431^2 + 5070^2 .

It is a cyclic number.

It is not a de Polignac number, because 55200661 - 2¹³ = 55192469 is a prime.

It is a super-2 number, since 2×55200661² = 6094225949673842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55200631) 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 as a sum of consecutive naturals, namely, 27600330 + 27600331.

It is an arithmetic number, because the mean of its divisors is an integer number (27600331).

Almost surely, 2^55200661 is an apocalyptic number.

It is an amenable number.

55200661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55200661 is an equidigital number, since it uses as much as digits as its factorization.

55200661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 55200661 is about 7429.7147320742. The cubic root of 55200661 is about 380.7571721903.

The spelling of 55200661 in words is "fifty-five million, two hundred thousand, six hundred sixty-one".