66140055 has 24 divisors (see below), whose sum is σ = 116359152. Its totient is φ = 34746624.

The previous prime is 66140033. The next prime is 66140069. The reversal of 66140055 is 55004166.

It is a happy number.

It is not a de Polignac number, because 66140055 - 2¹² = 66135959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7954 + ... + 13983.

It is an arithmetic number, because the mean of its divisors is an integer number (4848298).

Almost surely, 2^66140055 is an apocalyptic number.

66140055 is a deficient number, since it is larger than the sum of its proper divisors (50219097).

66140055 is a wasteful number, since it uses less digits than its factorization.

66140055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22015 (or 22012 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 66140055 is about 8132.6536259698. The cubic root of 66140055 is about 404.4096566006.

The spelling of 66140055 in words is "sixty-six million, one hundred forty thousand, fifty-five".