66610874880 has 1600 divisors, whose sum is σ = 288760982400. Its totient is φ = 14491975680.

The previous prime is 66610874873. The next prime is 66610874951. The reversal of 66610874880 is 8847801666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1256808934 + ... + 1256808986.

It is an arithmetic number, because the mean of its divisors is an integer number (180475614).

Almost surely, 2^66610874880 is an apocalyptic number.

66610874880 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 66610874880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144380491200).

66610874880 is an abundant number, since it is smaller than the sum of its proper divisors (222150107520).

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

66610874880 is a wasteful number, since it uses less digits than its factorization.

66610874880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 66610874880 in words is "sixty-six billion, six hundred ten million, eight hundred seventy-four thousand, eight hundred eighty".