81677255 has 16 divisors (see below), whose sum is σ = 111573504. Its totient is φ = 56818080.

The previous prime is 81677251. The next prime is 81677263. The reversal of 81677255 is 55277618.

It is not a de Polignac number, because 81677255 - 2² = 81677251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81677251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31019 + ... + 33548.

It is an arithmetic number, because the mean of its divisors is an integer number (6973344).

Almost surely, 2^81677255 is an apocalyptic number.

81677255 is a deficient number, since it is larger than the sum of its proper divisors (29896249).

81677255 is a wasteful number, since it uses less digits than its factorization.

81677255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64606.

The product of its digits is 117600, while the sum is 41.

The square root of 81677255 is about 9037.5469570011. The cubic root of 81677255 is about 433.8774155265.

The spelling of 81677255 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred fifty-five".