66211505120 has 48 divisors (see below), whose sum is σ = 156630520368. Its totient is φ = 26449751040.

The previous prime is 66211505027. The next prime is 66211505161. The reversal of 66211505120 is 2150511266.

It is a happy number.

66211505120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×66211505120³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150134 + ... + 393653.

It is an arithmetic number, because the mean of its divisors is an integer number (3263135841).

Almost surely, 2^66211505120 is an apocalyptic number.

It is an amenable number.

66211505120 is an abundant number, since it is smaller than the sum of its proper divisors (90419015248).

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

66211505120 is a wasteful number, since it uses less digits than its factorization.

66211505120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544563 (or 544555 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 66211505120 in words is "sixty-six billion, two hundred eleven million, five hundred five thousand, one hundred twenty".