66612698880 has 1152 divisors, whose sum is σ = 281306726400. Its totient is φ = 13042778112.

The previous prime is 66612698869. The next prime is 66612698897. The reversal of 66612698880 is 8889621666.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 524509377 + ... + 524509503.

Almost surely, 2^66612698880 is an apocalyptic number.

66612698880 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 66612698880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140653363200).

66612698880 is an abundant number, since it is smaller than the sum of its proper divisors (214694027520).

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

66612698880 is a wasteful number, since it uses less digits than its factorization.

66612698880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 60.

The spelling of 66612698880 in words is "sixty-six billion, six hundred twelve million, six hundred ninety-eight thousand, eight hundred eighty".