81598938965 has 8 divisors (see below), whose sum is σ = 102176062848. Its totient is φ = 62440927120.

The previous prime is 81598938931. The next prime is 81598938977. The reversal of 81598938965 is 56983989518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81598938965 - 2⁶ = 81598938901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354777881 + ... + 354778110.

It is an arithmetic number, because the mean of its divisors is an integer number (12772007856).

Almost surely, 2^81598938965 is an apocalyptic number.

It is an amenable number.

81598938965 is a deficient number, since it is larger than the sum of its proper divisors (20577123883).

81598938965 is a wasteful number, since it uses less digits than its factorization.

81598938965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709556019.

The product of its digits is 167961600, while the sum is 71.

The spelling of 81598938965 in words is "eighty-one billion, five hundred ninety-eight million, nine hundred thirty-eight thousand, nine hundred sixty-five".