81761133359 has 8 divisors (see below), whose sum is σ = 82395939120. Its totient is φ = 81126489600.

The previous prime is 81761133331. The next prime is 81761133367. The reversal of 81761133359 is 95333116718.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81761133359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81761133319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1095857 + ... + 1168085.

It is an arithmetic number, because the mean of its divisors is an integer number (10299492390).

Almost surely, 2^81761133359 is an apocalyptic number.

81761133359 is a deficient number, since it is larger than the sum of its proper divisors (634805761).

81761133359 is a wasteful number, since it uses less digits than its factorization.

81761133359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81001.

The product of its digits is 408240, while the sum is 47.

The spelling of 81761133359 in words is "eighty-one billion, seven hundred sixty-one million, one hundred thirty-three thousand, three hundred fifty-nine".