66693941600 has 216 divisors, whose sum is σ = 192733758000. Its totient is φ = 22386355200.

The previous prime is 66693941599. The next prime is 66693941617. The reversal of 66693941600 is 614939666.

It is a super-2 number, since 2×66693941600² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1231901 + ... + 1284899.

Almost surely, 2^66693941600 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 66693941600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96366879000).

66693941600 is an abundant number, since it is smaller than the sum of its proper divisors (126039816400).

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

66693941600 is a wasteful number, since it uses less digits than its factorization.

66693941600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53054 (or 53030 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 66693941600 in words is "sixty-six billion, six hundred ninety-three million, nine hundred forty-one thousand, six hundred".