81184414985 has 16 divisors (see below), whose sum is σ = 97828653312. Its totient is φ = 64676366400.

The previous prime is 81184414943. The next prime is 81184414999. The reversal of 81184414985 is 58941448118.

It is not a de Polignac number, because 81184414985 - 2¹⁴ = 81184398601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1625252 + ... + 1674458.

It is an arithmetic number, because the mean of its divisors is an integer number (6114290832).

Almost surely, 2^81184414985 is an apocalyptic number.

It is an amenable number.

81184414985 is a deficient number, since it is larger than the sum of its proper divisors (16644238327).

81184414985 is a wasteful number, since it uses less digits than its factorization.

81184414985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50584.

The product of its digits is 1474560, while the sum is 53.

The spelling of 81184414985 in words is "eighty-one billion, one hundred eighty-four million, four hundred fourteen thousand, nine hundred eighty-five".