666365055 has 16 divisors (see below), whose sum is σ = 1122299520. Its totient is φ = 336689568.

The previous prime is 666365053. The next prime is 666365059. The reversal of 666365055 is 550563666.

It is not a de Polignac number, because 666365055 - 2¹ = 666365053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666364998 and 666365016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666365053) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1168777 + ... + 1169346.

It is an arithmetic number, because the mean of its divisors is an integer number (70143720).

Almost surely, 2^666365055 is an apocalyptic number.

666365055 is a deficient number, since it is larger than the sum of its proper divisors (455934465).

666365055 is a wasteful number, since it uses less digits than its factorization.

666365055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338150.

The product of its (nonzero) digits is 486000, while the sum is 42.

The square root of 666365055 is about 25814.0476291495. The cubic root of 666365055 is about 873.4487038340.

The spelling of 666365055 in words is "six hundred sixty-six million, three hundred sixty-five thousand, fifty-five".