55661611 has 2 divisors, whose sum is σ = 55661612. Its totient is φ = 55661610.

The previous prime is 55661609. The next prime is 55661629. The reversal of 55661611 is 11616655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55661611 - 2¹ = 55661609 is a prime.

Together with 55661609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55664611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27830805 + 27830806.

It is an arithmetic number, because the mean of its divisors is an integer number (27830806).

Almost surely, 2^55661611 is an apocalyptic number.

55661611 is a deficient number, since it is larger than the sum of its proper divisors (1).

55661611 is an equidigital number, since it uses as much as digits as its factorization.

55661611 is an evil number, because the sum of its binary digits is even.

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

The square root of 55661611 is about 7460.6709483799. The cubic root of 55661611 is about 381.8140661980.

The spelling of 55661611 in words is "fifty-five million, six hundred sixty-one thousand, six hundred eleven".