81598938136 has 16 divisors (see below), whose sum is σ = 153142226640. Its totient is φ = 40761011040.

The previous prime is 81598938131. The next prime is 81598938151. The reversal of 81598938136 is 63183989518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81598938131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4798236 + ... + 4815211.

It is an arithmetic number, because the mean of its divisors is an integer number (9571389165).

Almost surely, 2^81598938136 is an apocalyptic number.

It is an amenable number.

81598938136 is a deficient number, since it is larger than the sum of its proper divisors (71543288504).

81598938136 is a wasteful number, since it uses less digits than its factorization.

81598938136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9614514 (or 9614510 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 61.

The spelling of 81598938136 in words is "eighty-one billion, five hundred ninety-eight million, nine hundred thirty-eight thousand, one hundred thirty-six".