1987518911918 has 8 divisors (see below), whose sum is σ = 3138187755720. Its totient is φ = 941456326680.

The previous prime is 1987518911893. The next prime is 1987518911933. The reversal of 1987518911918 is 8191198157891.

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

It is a congruent number.

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, 26151564593 + ... + 26151564668.

It is an arithmetic number, because the mean of its divisors is an integer number (392273469465).

Almost surely, 2^{1987518911918} is an apocalyptic number.

1987518911918 is a deficient number, since it is larger than the sum of its proper divisors (1150668843802).

1987518911918 is a wasteful number, since it uses less digits than its factorization.

1987518911918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52303129282.

The product of its digits is 13063680, while the sum is 68.

The spelling of 1987518911918 in words is "one trillion, nine hundred eighty-seven billion, five hundred eighteen million, nine hundred eleven thousand, nine hundred eighteen".