1987612166099 has 4 divisors (see below), whose sum is σ = 2271556761264. Its totient is φ = 1703667570936.

The previous prime is 1987612166093. The next prime is 1987612166117. The reversal of 1987612166099 is 9906612167891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1987612166099 - 2²⁸ = 1987343730643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987612166093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141972297572 + ... + 141972297585.

It is an arithmetic number, because the mean of its divisors is an integer number (567889190316).

Almost surely, 2^{1987612166099} is an apocalyptic number.

1987612166099 is a deficient number, since it is larger than the sum of its proper divisors (283944595165).

1987612166099 is an equidigital number, since it uses as much as digits as its factorization.

1987612166099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283944595164.

The product of its (nonzero) digits is 17635968, while the sum is 65.

The spelling of 1987612166099 in words is "one trillion, nine hundred eighty-seven billion, six hundred twelve million, one hundred sixty-six thousand, ninety-nine".