66518055 has 12 divisors (see below), whose sum is σ = 115298040. Its totient is φ = 35476272.

The previous prime is 66518009. The next prime is 66518057. The reversal of 66518055 is 55081566.

It is not a de Polignac number, because 66518055 - 2⁹ = 66517543 is a prime.

It is a super-3 number, since 3×66518055³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66518057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 739045 + ... + 739134.

It is an arithmetic number, because the mean of its divisors is an integer number (9608170).

Almost surely, 2^66518055 is an apocalyptic number.

66518055 is a deficient number, since it is larger than the sum of its proper divisors (48779985).

66518055 is a wasteful number, since it uses less digits than its factorization.

66518055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478190 (or 1478187 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 66518055 is about 8155.8601630975. The cubic root of 66518055 is about 405.1786134886.

It can be divided in two parts, 6651 and 8055, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 66518055 in words is "sixty-six million, five hundred eighteen thousand, fifty-five".