666700055 has 8 divisors (see below), whose sum is σ = 914331552. Its totient is φ = 457165728.

The previous prime is 666700051. The next prime is 666700061. The reversal of 666700055 is 550007666.

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 666700055 - 2² = 666700051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 19048573 = 666700055 / (6 + 6 + 6 + 7 + 0 + 0 + 0 + 5 + 5).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666699988 and 666700024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666700051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9524252 + ... + 9524321.

It is an arithmetic number, because the mean of its divisors is an integer number (114291444).

Almost surely, 2^666700055 is an apocalyptic number.

666700055 is a deficient number, since it is larger than the sum of its proper divisors (247631497).

666700055 is a wasteful number, since it uses less digits than its factorization.

666700055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19048585.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 666700055 is about 25820.5355289157. The cubic root of 666700055 is about 873.5950481907.

The spelling of 666700055 in words is "six hundred sixty-six million, seven hundred thousand, fifty-five".