1866942505387 has 8 divisors (see below), whose sum is σ = 1938944239200. Its totient is φ = 1796074657344.

The previous prime is 1866942505369. The next prime is 1866942505399. The reversal of 1866942505387 is 7835052496681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1866942505387 - 2¹¹ = 1866942503339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866942505367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283468087 + ... + 283474672.

It is an arithmetic number, because the mean of its divisors is an integer number (242368029900).

It is a 1-persistent number, because it is pandigital, but 2⋅1866942505387 = 3733885010774 is not.

Almost surely, 2^{1866942505387} is an apocalyptic number.

1866942505387 is a deficient number, since it is larger than the sum of its proper divisors (72001733813).

1866942505387 is an equidigital number, since it uses as much as digits as its factorization.

1866942505387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566942885.

The product of its (nonzero) digits is 87091200, while the sum is 64.

The spelling of 1866942505387 in words is "one trillion, eight hundred sixty-six billion, nine hundred forty-two million, five hundred five thousand, three hundred eighty-seven".