55511611 has 2 divisors, whose sum is σ = 55511612. Its totient is φ = 55511610.

The previous prime is 55511587. The next prime is 55511623. The reversal of 55511611 is 11611555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55511611 is a prime.

It is not a weakly prime, because it can be changed into another prime (55511671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27755805 + 27755806.

It is an arithmetic number, because the mean of its divisors is an integer number (27755806).

Almost surely, 2^55511611 is an apocalyptic number.

55511611 is a deficient number, since it is larger than the sum of its proper divisors (1).

55511611 is an equidigital number, since it uses as much as digits as its factorization.

55511611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 25.

The square root of 55511611 is about 7450.6114514179. The cubic root of 55511611 is about 381.4707797285.

The spelling of 55511611 in words is "fifty-five million, five hundred eleven thousand, six hundred eleven".