66220178628 has 48 divisors (see below), whose sum is σ = 159166848960. Its totient is φ = 21414681600.

The previous prime is 66220178581. The next prime is 66220178641. The reversal of 66220178628 is 82687102266.

It is a super-2 number, since 2×66220178628² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287893 + ... + 464028.

It is an arithmetic number, because the mean of its divisors is an integer number (3315976020).

Almost surely, 2^66220178628 is an apocalyptic number.

It is an amenable number.

66220178628 is an abundant number, since it is smaller than the sum of its proper divisors (92946670332).

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

66220178628 is a wasteful number, since it uses less digits than its factorization.

66220178628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752148 (or 752146 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 66220178628 in words is "sixty-six billion, two hundred twenty million, one hundred seventy-eight thousand, six hundred twenty-eight".