81395565135 has 32 divisors (see below), whose sum is σ = 130872000000. Its totient is φ = 43198448256.

The previous prime is 81395565107. The next prime is 81395565137. The reversal of 81395565135 is 53156559318.

It is a happy number.

It is not a de Polignac number, because 81395565135 - 2⁵ = 81395565103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81395565137) 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, 2596686 + ... + 2627844.

It is an arithmetic number, because the mean of its divisors is an integer number (4089750000).

Almost surely, 2^81395565135 is an apocalyptic number.

81395565135 is a deficient number, since it is larger than the sum of its proper divisors (49476434865).

81395565135 is a wasteful number, since it uses less digits than its factorization.

81395565135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32015.

The product of its digits is 2430000, while the sum is 51.

The spelling of 81395565135 in words is "eighty-one billion, three hundred ninety-five million, five hundred sixty-five thousand, one hundred thirty-five".