81444202887 has 16 divisors (see below), whose sum is σ = 110431369440. Its totient is φ = 53377536000.

The previous prime is 81444202843. The next prime is 81444202891. The reversal of 81444202887 is 78820244418.

It is not a de Polignac number, because 81444202887 - 2¹⁰ = 81444201863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81444202387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227887 + ... + 463487.

It is an arithmetic number, because the mean of its divisors is an integer number (6901960590).

Almost surely, 2^81444202887 is an apocalyptic number.

81444202887 is a deficient number, since it is larger than the sum of its proper divisors (28987166553).

81444202887 is a wasteful number, since it uses less digits than its factorization.

81444202887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237554.

The product of its (nonzero) digits is 917504, while the sum is 48.

The spelling of 81444202887 in words is "eighty-one billion, four hundred forty-four million, two hundred two thousand, eight hundred eighty-seven".