666880215 has 32 divisors (see below), whose sum is σ = 1104869376. Its totient is φ = 343121280.

The previous prime is 666880213. The next prime is 666880217. The reversal of 666880215 is 512088666.

It is an interprime number because it is at equal distance from previous prime (666880213) and next prime (666880217).

It is not a de Polignac number, because 666880215 - 2¹ = 666880213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666880213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159289 + ... + 163421.

It is an arithmetic number, because the mean of its divisors is an integer number (34527168).

Almost surely, 2^666880215 is an apocalyptic number.

666880215 is a deficient number, since it is larger than the sum of its proper divisors (437989161).

666880215 is a wasteful number, since it uses less digits than its factorization.

666880215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 666880215 is about 25824.0239893011. The cubic root of 666880215 is about 873.6737306048.

The spelling of 666880215 in words is "six hundred sixty-six million, eight hundred eighty thousand, two hundred fifteen".