66918055 has 8 divisors (see below), whose sum is σ = 81097344. Its totient is φ = 53004000.

The previous prime is 66918041. The next prime is 66918067. The reversal of 66918055 is 55081966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66918055 - 2⁷ = 66917927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66917999 and 66918017.

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 7 ways as a sum of consecutive naturals, for example, 65751 + ... + 66760.

It is an arithmetic number, because the mean of its divisors is an integer number (10137168).

Almost surely, 2^66918055 is an apocalyptic number.

66918055 is a deficient number, since it is larger than the sum of its proper divisors (14179289).

66918055 is a wasteful number, since it uses less digits than its factorization.

66918055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132617.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 66918055 is about 8180.3456528438. The cubic root of 66918055 is about 405.9891586321.

The spelling of 66918055 in words is "sixty-six million, nine hundred eighteen thousand, fifty-five".