66055511 has 2 divisors, whose sum is σ = 66055512. Its totient is φ = 66055510.

The previous prime is 66055481. The next prime is 66055519. The reversal of 66055511 is 11555066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66055511 - 2¹⁰ = 66054487 is a prime.

It is a super-2 number, since 2×66055511² = 8726661066942242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66055519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33027755 + 33027756.

It is an arithmetic number, because the mean of its divisors is an integer number (33027756).

Almost surely, 2^66055511 is an apocalyptic number.

66055511 is a deficient number, since it is larger than the sum of its proper divisors (1).

66055511 is an equidigital number, since it uses as much as digits as its factorization.

66055511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 66055511 is about 8127.4541524391. The cubic root of 66055511 is about 404.2372699463.

It can be divided in two parts, 66055 and 511, that added together give a palindrome (66566).

The spelling of 66055511 in words is "sixty-six million, fifty-five thousand, five hundred eleven".