87444307816666 has 4 divisors (see below), whose sum is σ = 131166461725002. Its totient is φ = 43722153908332.

The previous prime is 87444307816661. The next prime is 87444307816693. The reversal of 87444307816666 is 66661870344478.

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

It can be written as a sum of positive squares in only one way, i.e., 83905691600025 + 3538616216641 = 9160005^2 + 1881121^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87444307816595 and 87444307816604.

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 as a sum of consecutive naturals, namely, 21861076954165 + ... + 21861076954168.

Almost surely, 2^{87444307816666} is an apocalyptic number.

87444307816666 is a deficient number, since it is larger than the sum of its proper divisors (43722153908336).

87444307816666 is a wasteful number, since it uses less digits than its factorization.

87444307816666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43722153908335.

The product of its (nonzero) digits is 780337152, while the sum is 70.

The spelling of 87444307816666 in words is "eighty-seven trillion, four hundred forty-four billion, three hundred seven million, eight hundred sixteen thousand, six hundred sixty-six".