666102500 has 120 divisors (see below), whose sum is σ = 1763435520. Its totient is φ = 214848000.

The previous prime is 666102491. The next prime is 666102509. The reversal of 666102500 is 5201666.

It is an interprime number because it is at equal distance from previous prime (666102491) and next prime (666102509).

It is a self number, because there is not a number n which added to its sum of digits gives 666102500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666102509) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 296381 + ... + 298619.

It is an arithmetic number, because the mean of its divisors is an integer number (14695296).

Almost surely, 2^666102500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666102500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881717760).

666102500 is an abundant number, since it is smaller than the sum of its proper divisors (1097333020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666102500 is a wasteful number, since it uses less digits than its factorization.

666102500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287 (or 2270 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 666102500 is about 25808.9616218863. The cubic root of 666102500 is about 873.3339727025. Note that the first 3 decimals are identical.

The spelling of 666102500 in words is "six hundred sixty-six million, one hundred two thousand, five hundred".