1666850926818 has 32 divisors (see below), whose sum is σ = 4156303610880. Its totient is φ = 432948292560.

The previous prime is 1666850926817. The next prime is 1666850926877. The reversal of 1666850926818 is 8186290586661.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (1666850926817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1803950758 + ... + 1803951681.

It is an arithmetic number, because the mean of its divisors is an integer number (129884487840).

Almost surely, 2^{1666850926818} is an apocalyptic number.

1666850926818 is an abundant number, since it is smaller than the sum of its proper divisors (2489452684062).

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

1666850926818 is a wasteful number, since it uses less digits than its factorization.

1666850926818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607902462.

The product of its (nonzero) digits is 59719680, while the sum is 66.

The spelling of 1666850926818 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty million, nine hundred twenty-six thousand, eight hundred eighteen".