1866942505388 has 12 divisors (see below), whose sum is σ = 3379809708240. Its totient is φ = 901282588752.

The previous prime is 1866942505369. The next prime is 1866942505399. The reversal of 1866942505388 is 8835052496681.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8047165856 + ... + 8047166087.

It is an arithmetic number, because the mean of its divisors is an integer number (281650809020).

Almost surely, 2^{1866942505388} is an apocalyptic number.

It is an amenable number.

1866942505388 is a deficient number, since it is larger than the sum of its proper divisors (1512867202852).

1866942505388 is a wasteful number, since it uses less digits than its factorization.

1866942505388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16094331976 (or 16094331974 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 65.

The spelling of 1866942505388 in words is "one trillion, eight hundred sixty-six billion, nine hundred forty-two million, five hundred five thousand, three hundred eighty-eight".