81741807771 has 32 divisors (see below), whose sum is σ = 125644512000. Its totient is φ = 46847403648.

The previous prime is 81741807769. The next prime is 81741807793. The reversal of 81741807771 is 17770814718.

It is not a de Polignac number, because 81741807771 - 2¹ = 81741807769 is a prime.

It is a super-2 number, since 2×81741807771² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81741807751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 891136 + ... + 978573.

It is an arithmetic number, because the mean of its divisors is an integer number (3926391000).

Almost surely, 2^81741807771 is an apocalyptic number.

81741807771 is a deficient number, since it is larger than the sum of its proper divisors (43902704229).

81741807771 is a wasteful number, since it uses less digits than its factorization.

81741807771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869803.

The product of its (nonzero) digits is 614656, while the sum is 51.

The spelling of 81741807771 in words is "eighty-one billion, seven hundred forty-one million, eight hundred seven thousand, seven hundred seventy-one".