66616080944220 has 72 divisors (see below), whose sum is σ = 212703977762640. Its totient is φ = 16829325711360.

The previous prime is 66616080944141. The next prime is 66616080944227. The reversal of 66616080944220 is 2244908061666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616080944227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9739189701 + ... + 9739196540.

It is an arithmetic number, because the mean of its divisors is an integer number (2954221913370).

Almost surely, 2^{66616080944220} is an apocalyptic number.

66616080944220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66616080944220 is an abundant number, since it is smaller than the sum of its proper divisors (146087896818420).

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

66616080944220 is a wasteful number, since it uses less digits than its factorization.

66616080944220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19478386275 (or 19478386270 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 66616080944220 in words is "sixty-six trillion, six hundred sixteen billion, eighty million, nine hundred forty-four thousand, two hundred twenty".