666615152 has 80 divisors (see below), whose sum is σ = 1645251840. Its totient is φ = 254721024.

The previous prime is 666615149. The next prime is 666615167. The reversal of 666615152 is 251516666.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26963 + ... + 45389.

It is an arithmetic number, because the mean of its divisors is an integer number (20565648).

Almost surely, 2^666615152 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 666615152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822625920).

666615152 is an abundant number, since it is smaller than the sum of its proper divisors (978636688).

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

666615152 is a wasteful number, since it uses less digits than its factorization.

666615152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18478 (or 18472 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The square root of 666615152 is about 25818.8913782137. The cubic root of 666615152 is about 873.5579630535.

The spelling of 666615152 in words is "six hundred sixty-six million, six hundred fifteen thousand, one hundred fifty-two".