66791055 has 8 divisors (see below), whose sum is σ = 106865712. Its totient is φ = 35621888.

The previous prime is 66791047. The next prime is 66791059. The reversal of 66791055 is 55019766.

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

It is a cyclic number.

It is not a de Polignac number, because 66791055 - 2³ = 66791047 is a prime.

It is a super-2 number, since 2×66791055² = 8922090056026050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66791059) by changing a digit.

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, 2226354 + ... + 2226383.

It is an arithmetic number, because the mean of its divisors is an integer number (13358214).

Almost surely, 2^66791055 is an apocalyptic number.

66791055 is a deficient number, since it is larger than the sum of its proper divisors (40074657).

66791055 is a wasteful number, since it uses less digits than its factorization.

66791055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452745.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 66791055 is about 8172.5794581637. The cubic root of 66791055 is about 405.7321613460.

The spelling of 66791055 in words is "sixty-six million, seven hundred ninety-one thousand, fifty-five".