66215645500 has 48 divisors (see below), whose sum is σ = 144643681728. Its totient is φ = 26481000000.

The previous prime is 66215645497. The next prime is 66215645521. The reversal of 66215645500 is 554651266.

66215645500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3385750 + ... + 3405250.

It is an arithmetic number, because the mean of its divisors is an integer number (3013410036).

Almost surely, 2^66215645500 is an apocalyptic number.

It is an amenable number.

66215645500 is an abundant number, since it is smaller than the sum of its proper divisors (78428036228).

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

66215645500 is a wasteful number, since it uses less digits than its factorization.

66215645500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26311 (or 26299 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 66215645500 in words is "sixty-six billion, two hundred fifteen million, six hundred forty-five thousand, five hundred".