81145081335 has 32 divisors (see below), whose sum is σ = 131992498368. Its totient is φ = 42557598720.

The previous prime is 81145081331. The next prime is 81145081357. The reversal of 81145081335 is 53318054118.

It is not a de Polignac number, because 81145081335 - 2² = 81145081331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81145081293 and 81145081302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81145081331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5091339 + ... + 5107251.

It is an arithmetic number, because the mean of its divisors is an integer number (4124765574).

Almost surely, 2^81145081335 is an apocalyptic number.

81145081335 is a deficient number, since it is larger than the sum of its proper divisors (50847417033).

81145081335 is a wasteful number, since it uses less digits than its factorization.

81145081335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21555.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 81145081335 in words is "eighty-one billion, one hundred forty-five million, eighty-one thousand, three hundred thirty-five".