81463956889 has 16 divisors (see below), whose sum is σ = 93558643200. Its totient is φ = 69484068864.

The previous prime is 81463956809. The next prime is 81463956911. The reversal of 81463956889 is 98865936418.

It is not a de Polignac number, because 81463956889 - 2⁹ = 81463956377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81463956809) 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, 1792752 + ... + 1837630.

It is an arithmetic number, because the mean of its divisors is an integer number (5847415200).

Almost surely, 2^81463956889 is an apocalyptic number.

It is an amenable number.

81463956889 is a deficient number, since it is larger than the sum of its proper divisors (12094686311).

81463956889 is a wasteful number, since it uses less digits than its factorization.

81463956889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46152.

The product of its digits is 89579520, while the sum is 67.

The spelling of 81463956889 in words is "eighty-one billion, four hundred sixty-three million, nine hundred fifty-six thousand, eight hundred eighty-nine".