66655510400 has 96 divisors (see below), whose sum is σ = 165191860080. Its totient is φ = 26576076800.

The previous prime is 66655510373. The next prime is 66655510429. The reversal of 66655510400 is 401555666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 961712 + ... + 1028688.

Almost surely, 2^66655510400 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 66655510400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82595930040).

66655510400 is an abundant number, since it is smaller than the sum of its proper divisors (98536349680).

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

66655510400 is a wasteful number, since it uses less digits than its factorization.

66655510400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67312 (or 67295 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 66655510400 in words is "sixty-six billion, six hundred fifty-five million, five hundred ten thousand, four hundred".