66945409188 has 48 divisors (see below), whose sum is σ = 178659661824. Its totient is φ = 19112412960.

The previous prime is 66945409169. The next prime is 66945409213. The reversal of 66945409188 is 88190454966.

It is a super-2 number, since 2×66945409188² (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, 200220 + ... + 417107.

It is an arithmetic number, because the mean of its divisors is an integer number (3722076288).

Almost surely, 2^66945409188 is an apocalyptic number.

It is an amenable number.

66945409188 is an abundant number, since it is smaller than the sum of its proper divisors (111714252636).

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

66945409188 is a wasteful number, since it uses less digits than its factorization.

66945409188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618632 (or 618630 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 66945409188 in words is "sixty-six billion, nine hundred forty-five million, four hundred nine thousand, one hundred eighty-eight".