1881585968218 has 12 divisors (see below), whose sum is σ = 3102284303370. Its totient is φ = 855266349080.

The previous prime is 1881585968191. The next prime is 1881585968281. The reversal of 1881585968218 is 8128695851881.

It can be written as a sum of positive squares in only one way, i.e., 1498829687289 + 382756280929 = 1224267^2 + 618673^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3887574073 + ... + 3887574556.

Almost surely, 2^{1881585968218} is an apocalyptic number.

1881585968218 is a deficient number, since it is larger than the sum of its proper divisors (1220698335152).

1881585968218 is a wasteful number, since it uses less digits than its factorization.

1881585968218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775148653 (or 7775148642 counting only the distinct ones).

The product of its digits is 88473600, while the sum is 70.

The spelling of 1881585968218 in words is "one trillion, eight hundred eighty-one billion, five hundred eighty-five million, nine hundred sixty-eight thousand, two hundred eighteen".