81255891314 has 8 divisors (see below), whose sum is σ = 131259516780. Its totient is φ = 37502719056.

The previous prime is 81255891293. The next prime is 81255891317. The reversal of 81255891314 is 41319855218.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 73340764225 + 7915127089 = 270815^2 + 88967^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81255891317) 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, 1562613269 + ... + 1562613320.

Almost surely, 2^81255891314 is an apocalyptic number.

81255891314 is a deficient number, since it is larger than the sum of its proper divisors (50003625466).

81255891314 is a wasteful number, since it uses less digits than its factorization.

81255891314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125226604.

The product of its digits is 345600, while the sum is 47.

The spelling of 81255891314 in words is "eighty-one billion, two hundred fifty-five million, eight hundred ninety-one thousand, three hundred fourteen".