66015136 has 72 divisors (see below), whose sum is σ = 147498624. Its totient is φ = 28842240.

The previous prime is 66015133. The next prime is 66015137. The reversal of 66015136 is 63151066.

It is not an unprimeable number, because it can be changed into a prime (66015133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295921 + ... + 296143.

It is an arithmetic number, because the mean of its divisors is an integer number (2048592).

Almost surely, 2^66015136 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 66015136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73749312).

66015136 is an abundant number, since it is smaller than the sum of its proper divisors (81483488).

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

66015136 is a wasteful number, since it uses less digits than its factorization.

66015136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 66015136 is about 8124.9699076366. The cubic root of 66015136 is about 404.1548927357.

The spelling of 66015136 in words is "sixty-six million, fifteen thousand, one hundred thirty-six".