81453194042 has 16 divisors (see below), whose sum is σ = 133302780864. Its totient is φ = 37019808000.

The previous prime is 81453193907. The next prime is 81453194057. The reversal of 81453194042 is 24049135418.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24134 + ... + 404337.

It is an arithmetic number, because the mean of its divisors is an integer number (8331423804).

Almost surely, 2^81453194042 is an apocalyptic number.

81453194042 is a deficient number, since it is larger than the sum of its proper divisors (51849586822).

81453194042 is a wasteful number, since it uses less digits than its factorization.

81453194042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437125.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 81453194042 in words is "eighty-one billion, four hundred fifty-three million, one hundred ninety-four thousand, forty-two".