81454363385 has 16 divisors (see below), whose sum is σ = 98873394816. Its totient is φ = 64413024768.

The previous prime is 81454363369. The next prime is 81454363387. The reversal of 81454363385 is 58336345418.

It is a cyclic number.

It is not a de Polignac number, because 81454363385 - 2⁴ = 81454363369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81454363387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297122 + ... + 501188.

It is an arithmetic number, because the mean of its divisors is an integer number (6179587176).

Almost surely, 2^81454363385 is an apocalyptic number.

It is an amenable number.

81454363385 is a deficient number, since it is larger than the sum of its proper divisors (17419031431).

81454363385 is a wasteful number, since it uses less digits than its factorization.

81454363385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204992.

The product of its digits is 4147200, while the sum is 50.

The spelling of 81454363385 in words is "eighty-one billion, four hundred fifty-four million, three hundred sixty-three thousand, three hundred eighty-five".