81781677941 has 8 divisors (see below), whose sum is σ = 88087977120. Its totient is φ = 75675578832.

The previous prime is 81781677869. The next prime is 81781677959. The reversal of 81781677941 is 14977618718.

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

It is a cyclic number.

It is not a de Polignac number, because 81781677941 - 2²⁶ = 81714569077 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 (81781677541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50049170 + ... + 50050803.

It is an arithmetic number, because the mean of its divisors is an integer number (11010997140).

Almost surely, 2^81781677941 is an apocalyptic number.

It is an amenable number.

81781677941 is a deficient number, since it is larger than the sum of its proper divisors (6306299179).

81781677941 is a wasteful number, since it uses less digits than its factorization.

81781677941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100100035.

The product of its digits is 4741632, while the sum is 59.

The spelling of 81781677941 in words is "eighty-one billion, seven hundred eighty-one million, six hundred seventy-seven thousand, nine hundred forty-one".