81254500178 has 24 divisors (see below), whose sum is σ = 124704018432. Its totient is φ = 39705191064.

The previous prime is 81254500169. The next prime is 81254500199. The reversal of 81254500178 is 87100545218.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1104575 + ... + 1175837.

It is an arithmetic number, because the mean of its divisors is an integer number (5196000768).

Almost surely, 2^81254500178 is an apocalyptic number.

81254500178 is a deficient number, since it is larger than the sum of its proper divisors (43449518254).

81254500178 is a wasteful number, since it uses less digits than its factorization.

81254500178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71526 (or 71459 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 41.

The spelling of 81254500178 in words is "eighty-one billion, two hundred fifty-four million, five hundred thousand, one hundred seventy-eight".