81635804302 has 32 divisors (see below), whose sum is σ = 136309469184. Its totient is φ = 36413820000.

The previous prime is 81635804273. The next prime is 81635804303. The reversal of 81635804302 is 20340853618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81635804303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537873 + ... + 672739.

It is an arithmetic number, because the mean of its divisors is an integer number (4259670912).

Almost surely, 2^81635804302 is an apocalyptic number.

81635804302 is a deficient number, since it is larger than the sum of its proper divisors (54673664882).

81635804302 is a wasteful number, since it uses less digits than its factorization.

81635804302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135664.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 81635804302 in words is "eighty-one billion, six hundred thirty-five million, eight hundred four thousand, three hundred two".