81295223278 has 8 divisors (see below), whose sum is σ = 128360878920. Its totient is φ = 38508263640.

The previous prime is 81295223249. The next prime is 81295223279. The reversal of 81295223278 is 87232259218.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81295223279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069673953 + ... + 1069674028.

It is an arithmetic number, because the mean of its divisors is an integer number (16045109865).

Almost surely, 2^81295223278 is an apocalyptic number.

81295223278 is a deficient number, since it is larger than the sum of its proper divisors (47065655642).

81295223278 is a wasteful number, since it uses less digits than its factorization.

81295223278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139348002.

The product of its digits is 967680, while the sum is 49.

The spelling of 81295223278 in words is "eighty-one billion, two hundred ninety-five million, two hundred twenty-three thousand, two hundred seventy-eight".