66655518338600 has 96 divisors (see below), whose sum is σ = 157052358630720. Its totient is φ = 26305518865920.

The previous prime is 66655518338587. The next prime is 66655518338671. The reversal of 66655518338600 is 683381555666.

It is a super-3 number, since 3×66655518338600³ (a number of 42 digits) contains 333 as substring.

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, 9631652 + ... + 15035948.

It is an arithmetic number, because the mean of its divisors is an integer number (1635962069070).

Almost surely, 2^{66655518338600} 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 66655518338600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78526179315360).

66655518338600 is an abundant number, since it is smaller than the sum of its proper divisors (90396840292120).

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

66655518338600 is a wasteful number, since it uses less digits than its factorization.

66655518338600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405139 (or 5405130 counting only the distinct ones).

The product of its (nonzero) digits is 93312000, while the sum is 62.

The spelling of 66655518338600 in words is "sixty-six trillion, six hundred fifty-five billion, five hundred eighteen million, three hundred thirty-eight thousand, six hundred".