66240055 has 16 divisors (see below), whose sum is σ = 91232064. Its totient is φ = 45227520.

The previous prime is 66240043. The next prime is 66240071. The reversal of 66240055 is 55004266.

It is not a de Polignac number, because 66240055 - 2²⁵ = 32685623 is a prime.

It is a super-3 number, since 3×66240055³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4509 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (5702004).

Almost surely, 2^66240055 is an apocalyptic number.

66240055 is a deficient number, since it is larger than the sum of its proper divisors (24992009).

66240055 is a wasteful number, since it uses less digits than its factorization.

66240055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 66240055 is about 8138.7993586278. The cubic root of 66240055 is about 404.6133687651.

It can be divided in two parts, 6624005 and 5, that multiplied together give a square (33120025 = 5755²).

The spelling of 66240055 in words is "sixty-six million, two hundred forty thousand, fifty-five".