66665204406126 has 24 divisors (see below), whose sum is σ = 144902749951440. Its totient is φ = 22150738842336.

The previous prime is 66665204406037. The next prime is 66665204406133. The reversal of 66665204406126 is 62160440256666.

It is a super-2 number, since 2×66665204406126² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5916324186 + ... + 5916335453.

It is an arithmetic number, because the mean of its divisors is an integer number (6037614581310).

Almost surely, 2^{66665204406126} is an apocalyptic number.

66665204406126 is an abundant number, since it is smaller than the sum of its proper divisors (78237545545314).

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

66665204406126 is a wasteful number, since it uses less digits than its factorization.

66665204406126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11832659960 (or 11832659957 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 54.

The spelling of 66665204406126 in words is "sixty-six trillion, six hundred sixty-five billion, two hundred four million, four hundred six thousand, one hundred twenty-six".