987665543311111 has 32 divisors (see below), whose sum is σ = 1137058480189440. Its totient is φ = 840372479280000.

The previous prime is 987665543310989. The next prime is 987665543311171. The reversal of 987665543311111 is 111113345566789.

It is a cyclic number.

It is not a de Polignac number, because 987665543311111 - 2⁹ = 987665543310599 is a prime.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 987665543311111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987665543311171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1225747861 + ... + 1226553361.

It is an arithmetic number, because the mean of its divisors is an integer number (35533077505920).

Almost surely, 2^{987665543311111} is an apocalyptic number.

987665543311111 is a deficient number, since it is larger than the sum of its proper divisors (149392936878329).

987665543311111 is a wasteful number, since it uses less digits than its factorization.

987665543311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808135.

The product of its digits is 16329600, while the sum is 61.

The spelling of 987665543311111 in words is "nine hundred eighty-seven trillion, six hundred sixty-five billion, five hundred forty-three million, three hundred eleven thousand, one hundred eleven".