66126827661666 has 64 divisors (see below), whose sum is σ = 139390136409600. Its totient is φ = 20855803332096.

The previous prime is 66126827661589. The next prime is 66126827661677. The reversal of 66126827661666 is 66616672862166.

It is a self number, because there is not a number n which added to its sum of digits gives 66126827661666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423114610 + ... + 423270866.

It is an arithmetic number, because the mean of its divisors is an integer number (2177970881400).

Almost surely, 2^{66126827661666} is an apocalyptic number.

66126827661666 is an abundant number, since it is smaller than the sum of its proper divisors (73263308747934).

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

66126827661666 is a wasteful number, since it uses less digits than its factorization.

66126827661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160943.

The product of its digits is 376233984, while the sum is 69.

The spelling of 66126827661666 in words is "sixty-six trillion, one hundred twenty-six billion, eight hundred twenty-seven million, six hundred sixty-one thousand, six hundred sixty-six".