81803136070 has 16 divisors (see below), whose sum is σ = 153647629920. Its totient is φ = 31298591104.

The previous prime is 81803136067. The next prime is 81803136091. The reversal of 81803136070 is 7063130818.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 177832675 + ... + 177833134.

It is an arithmetic number, because the mean of its divisors is an integer number (9602976870).

Almost surely, 2^81803136070 is an apocalyptic number.

81803136070 is a deficient number, since it is larger than the sum of its proper divisors (71844493850).

81803136070 is a wasteful number, since it uses less digits than its factorization.

81803136070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355665839.

The product of its (nonzero) digits is 24192, while the sum is 37.

Adding to 81803136070 its reverse (7063130818), we get a palindrome (88866266888).

The spelling of 81803136070 in words is "eighty-one billion, eight hundred three million, one hundred thirty-six thousand, seventy".