55585661 has 2 divisors, whose sum is σ = 55585662. Its totient is φ = 55585660.

The previous prime is 55585637. The next prime is 55585757. The reversal of 55585661 is 16658555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30525625 + 25060036 = 5525^2 + 5006^2 .

It is a cyclic number.

It is not a de Polignac number, because 55585661 - 2¹⁸ = 55323517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55585561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27792830 + 27792831.

It is an arithmetic number, because the mean of its divisors is an integer number (27792831).

Almost surely, 2^55585661 is an apocalyptic number.

It is an amenable number.

55585661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55585661 is an equidigital number, since it uses as much as digits as its factorization.

55585661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180000, while the sum is 41.

The square root of 55585661 is about 7455.5791860861. The cubic root of 55585661 is about 381.6403260003.

The spelling of 55585661 in words is "fifty-five million, five hundred eighty-five thousand, six hundred sixty-one".