66115111152 has 80 divisors (see below), whose sum is σ = 175494481920. Its totient is φ = 21432842496.

The previous prime is 66115111079. The next prime is 66115111157. The reversal of 66115111152 is 25111151166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66115111157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4509049 + ... + 4523687.

It is an arithmetic number, because the mean of its divisors is an integer number (2193681024).

Almost surely, 2^66115111152 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 66115111152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87747240960).

66115111152 is an abundant number, since it is smaller than the sum of its proper divisors (109379370768).

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

66115111152 is a wasteful number, since it uses less digits than its factorization.

66115111152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17230 (or 17224 counting only the distinct ones).

The product of its digits is 1800, while the sum is 30.

The spelling of 66115111152 in words is "sixty-six billion, one hundred fifteen million, one hundred eleven thousand, one hundred fifty-two".