81093190455 has 24 divisors (see below), whose sum is σ = 140572523520. Its totient is φ = 43246319040.

The previous prime is 81093190433. The next prime is 81093190463. The reversal of 81093190455 is 55409139018.

81093190455 is a `hidden beast` number, since 8 + 1 + 0 + 9 + 3 + 190 + 455 = 666.

It is not a de Polignac number, because 81093190455 - 2²⁷ = 80958972727 is a prime.

It is a super-2 number, since 2×81093190455² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81093190455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 576586 + ... + 703304.

It is an arithmetic number, because the mean of its divisors is an integer number (5857188480).

Almost surely, 2^81093190455 is an apocalyptic number.

81093190455 is a deficient number, since it is larger than the sum of its proper divisors (59479333065).

81093190455 is a wasteful number, since it uses less digits than its factorization.

81093190455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140951 (or 140948 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 81093190455 in words is "eighty-one billion, ninety-three million, one hundred ninety thousand, four hundred fifty-five".