81553335135 has 32 divisors (see below), whose sum is σ = 133697124288. Its totient is φ = 42424980480.

The previous prime is 81553335131. The next prime is 81553335179. The reversal of 81553335135 is 53153335518.

It is not a de Polignac number, because 81553335135 - 2² = 81553335131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81553335131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3489549 + ... + 3512841.

It is an arithmetic number, because the mean of its divisors is an integer number (4178035134).

Almost surely, 2^81553335135 is an apocalyptic number.

81553335135 is a deficient number, since it is larger than the sum of its proper divisors (52143789153).

81553335135 is a wasteful number, since it uses less digits than its factorization.

81553335135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29035.

The product of its digits is 405000, while the sum is 42.

The spelling of 81553335135 in words is "eighty-one billion, five hundred fifty-three million, three hundred thirty-five thousand, one hundred thirty-five".