135899998081 has 16 divisors (see below), whose sum is σ = 138490957440. Its totient is φ = 133321288320.

The previous prime is 135899998051. The next prime is 135899998109. The reversal of 135899998081 is 180899998531.

It is a cyclic number.

It is not a de Polignac number, because 135899998081 - 2¹¹ = 135899996033 is a prime.

It is a super-2 number, since 2×135899998081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135899998081.

It is not an unprimeable number, because it can be changed into a prime (135899998001) 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, 54952261 + ... + 54954733.

It is an arithmetic number, because the mean of its divisors is an integer number (8655684840).

Almost surely, 2^135899998081 is an apocalyptic number.

It is an amenable number.

135899998081 is a deficient number, since it is larger than the sum of its proper divisors (2590959359).

135899998081 is a wasteful number, since it uses less digits than its factorization.

135899998081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536.

The product of its (nonzero) digits is 50388480, while the sum is 70.

The spelling of 135899998081 in words is "one hundred thirty-five billion, eight hundred ninety-nine million, nine hundred ninety-eight thousand, eighty-one".