81452915193 has 8 divisors (see below), whose sum is σ = 116958032128. Its totient is φ = 50124870864.

The previous prime is 81452915179. The next prime is 81452915197. The reversal of 81452915193 is 39151925418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81452915193 - 2¹⁶ = 81452849657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81452915197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044268105 + ... + 1044268182.

It is an arithmetic number, because the mean of its divisors is an integer number (14619754016).

Almost surely, 2^81452915193 is an apocalyptic number.

It is an amenable number.

81452915193 is a deficient number, since it is larger than the sum of its proper divisors (35505116935).

81452915193 is a wasteful number, since it uses less digits than its factorization.

81452915193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088536303.

The product of its digits is 388800, while the sum is 48.

The spelling of 81452915193 in words is "eighty-one billion, four hundred fifty-two million, nine hundred fifteen thousand, one hundred ninety-three".