87444307816665 has 32 divisors (see below), whose sum is σ = 148144619675520. Its totient is φ = 43892524545024.

The previous prime is 87444307816661. The next prime is 87444307816693. The reversal of 87444307816665 is 56661870344478.

It is not a de Polignac number, because 87444307816665 - 2² = 87444307816661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87444307816665.

It is not an unprimeable number, because it can be changed into a prime (87444307816661) 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, 6096451 + ... + 14562119.

It is an arithmetic number, because the mean of its divisors is an integer number (4629519364860).

Almost surely, 2^{87444307816665} is an apocalyptic number.

87444307816665 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87444307816665 is a deficient number, since it is larger than the sum of its proper divisors (60700311858855).

87444307816665 is a wasteful number, since it uses less digits than its factorization.

87444307816665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506201.

The product of its (nonzero) digits is 650280960, while the sum is 69.

The spelling of 87444307816665 in words is "eighty-seven trillion, four hundred forty-four billion, three hundred seven million, eight hundred sixteen thousand, six hundred sixty-five".