81450708195 has 32 divisors (see below), whose sum is σ = 132816635712. Its totient is φ = 42608996352.

The previous prime is 81450708191. The next prime is 81450708203. The reversal of 81450708195 is 59180705418.

It is a happy number.

It is not a de Polignac number, because 81450708195 - 2² = 81450708191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81450708191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3385047 + ... + 3409023.

It is an arithmetic number, because the mean of its divisors is an integer number (4150519866).

Almost surely, 2^81450708195 is an apocalyptic number.

81450708195 is a deficient number, since it is larger than the sum of its proper divisors (51365927517).

81450708195 is a wasteful number, since it uses less digits than its factorization.

81450708195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28311.

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 81450708195 in words is "eighty-one billion, four hundred fifty million, seven hundred eight thousand, one hundred ninety-five".