66520512120 has 96 divisors (see below), whose sum is σ = 201151112400. Its totient is φ = 17598615552.

The previous prime is 66520512059. The next prime is 66520512131. The reversal of 66520512120 is 2121502566.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1918296 + ... + 1952664.

Almost surely, 2^66520512120 is an apocalyptic number.

66520512120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66520512120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100575556200).

66520512120 is an abundant number, since it is smaller than the sum of its proper divisors (134630600280).

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

66520512120 is a wasteful number, since it uses less digits than its factorization.

66520512120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34637 (or 34506 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 66520512120 in words is "sixty-six billion, five hundred twenty million, five hundred twelve thousand, one hundred twenty".