81255106258 has 8 divisors (see below), whose sum is σ = 123252127740. Its totient is φ = 40171063680.

The previous prime is 81255106249. The next prime is 81255106343. The reversal of 81255106258 is 85260155218.

It can be written as a sum of positive squares in 2 ways, for example, as 67245306489 + 14009799769 = 259317^2 + 118363^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228244503 + ... + 228244858.

Almost surely, 2^81255106258 is an apocalyptic number.

81255106258 is a deficient number, since it is larger than the sum of its proper divisors (41997021482).

81255106258 is a wasteful number, since it uses less digits than its factorization.

81255106258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456489452.

The product of its (nonzero) digits is 192000, while the sum is 43.

The spelling of 81255106258 in words is "eighty-one billion, two hundred fifty-five million, one hundred six thousand, two hundred fifty-eight".