666615055 has 8 divisors (see below), whose sum is σ = 800917344. Its totient is φ = 532639200.

The previous prime is 666615013. The next prime is 666615091. The reversal of 666615055 is 550516666.

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

It is not a de Polignac number, because 666615055 - 2¹⁹ = 666090767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666614999 and 666615017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77091 + ... + 85300.

It is an arithmetic number, because the mean of its divisors is an integer number (100114668).

Almost surely, 2^666615055 is an apocalyptic number.

666615055 is a deficient number, since it is larger than the sum of its proper divisors (134302289).

666615055 is a wasteful number, since it uses less digits than its factorization.

666615055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163217.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 666615055 is about 25818.8894997442. The cubic root of 666615055 is about 873.5579206826.

The spelling of 666615055 in words is "six hundred sixty-six million, six hundred fifteen thousand, fifty-five".