66655068480 has 1680 divisors, whose sum is σ = 324916897536. Its totient is φ = 12750151680.

The previous prime is 66655068479. The next prime is 66655068499. The reversal of 66655068480 is 8486055666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1680).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 181621257 + ... + 181621623.

Almost surely, 2^66655068480 is an apocalyptic number.

66655068480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66655068480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162458448768).

66655068480 is an abundant number, since it is smaller than the sum of its proper divisors (258261829056).

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

66655068480 is a wasteful number, since it uses less digits than its factorization.

66655068480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 66655068480 in words is "sixty-six billion, six hundred fifty-five million, sixty-eight thousand, four hundred eighty".