81835869435 has 16 divisors (see below), whose sum is σ = 134476240416. Its totient is φ = 42466180608.

The previous prime is 81835869431. The next prime is 81835869449. The reversal of 81835869435 is 53496853818.

It is not a de Polignac number, because 81835869435 - 2² = 81835869431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81835869431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73725454 + ... + 73726563.

It is an arithmetic number, because the mean of its divisors is an integer number (8404765026).

Almost surely, 2^81835869435 is an apocalyptic number.

81835869435 is a deficient number, since it is larger than the sum of its proper divisors (52640370981).

81835869435 is a wasteful number, since it uses less digits than its factorization.

81835869435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147452062.

The product of its digits is 24883200, while the sum is 60.

The spelling of 81835869435 in words is "eighty-one billion, eight hundred thirty-five million, eight hundred sixty-nine thousand, four hundred thirty-five".