66578605860 has 384 divisors, whose sum is σ = 220722969600. Its totient is φ = 14842331136.

The previous prime is 66578605837. The next prime is 66578605867. The reversal of 66578605860 is 6850687566.

It is a super-2 number, since 2×66578605860² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66578605860.

It is not an unprimeable number, because it can be changed into a prime (66578605867) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47589441 + ... + 47590839.

It is an arithmetic number, because the mean of its divisors is an integer number (574799400).

Almost surely, 2^66578605860 is an apocalyptic number.

66578605860 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 66578605860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110361484800).

66578605860 is an abundant number, since it is smaller than the sum of its proper divisors (154144363740).

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

66578605860 is a wasteful number, since it uses less digits than its factorization.

66578605860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 57.

The spelling of 66578605860 in words is "sixty-six billion, five hundred seventy-eight million, six hundred five thousand, eight hundred sixty".