81197455919455 has 16 divisors (see below), whose sum is σ = 97506147551904. Its totient is φ = 64911833078400.

The previous prime is 81197455919389. The next prime is 81197455919491. The reversal of 81197455919455 is 55491955479118.

It is not a de Polignac number, because 81197455919455 - 2³⁵ = 81163096181087 is a prime.

It is a Duffinian number.

It is a congruent 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, 438691680 + ... + 438876730.

It is an arithmetic number, because the mean of its divisors is an integer number (6094134221994).

Almost surely, 2^{81197455919455} is an apocalyptic number.

81197455919455 is a deficient number, since it is larger than the sum of its proper divisors (16308691632449).

81197455919455 is a wasteful number, since it uses less digits than its factorization.

81197455919455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246906.

The product of its digits is 408240000, while the sum is 73.

The spelling of 81197455919455 in words is "eighty-one trillion, one hundred ninety-seven billion, four hundred fifty-five million, nine hundred nineteen thousand, four hundred fifty-five".