81051741771 has 96 divisors (see below), whose sum is σ = 147953030400. Its totient is φ = 38796952320.

The previous prime is 81051741769. The next prime is 81051741781. The reversal of 81051741771 is 17714715018.

It is not a de Polignac number, because 81051741771 - 2¹ = 81051741769 is a prime.

It is a super-2 number, since 2×81051741771² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81051741731) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13008885 + ... + 13015113.

It is an arithmetic number, because the mean of its divisors is an integer number (1541177400).

Almost surely, 2^81051741771 is an apocalyptic number.

81051741771 is a deficient number, since it is larger than the sum of its proper divisors (66901288629).

81051741771 is a wasteful number, since it uses less digits than its factorization.

81051741771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889 (or 6882 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 42.

The spelling of 81051741771 in words is "eighty-one billion, fifty-one million, seven hundred forty-one thousand, seven hundred seventy-one".