1866105118987 has 2 divisors, whose sum is σ = 1866105118988. Its totient is φ = 1866105118986.

The previous prime is 1866105118961. The next prime is 1866105119023. The reversal of 1866105118987 is 7898115016681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1866105118987 - 2³¹ = 1863957635339 is a prime.

It is not a weakly prime, because it can be changed into another prime (1866105118487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933052559493 + 933052559494.

It is an arithmetic number, because the mean of its divisors is an integer number (933052559494).

Almost surely, 2^{1866105118987} is an apocalyptic number.

1866105118987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866105118987 is an equidigital number, since it uses as much as digits as its factorization.

1866105118987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 61.

The spelling of 1866105118987 in words is "one trillion, eight hundred sixty-six billion, one hundred five million, one hundred eighteen thousand, nine hundred eighty-seven".