81173866151 has 16 divisors (see below), whose sum is σ = 98394621696. Its totient is φ = 65373184896.

The previous prime is 81173866097. The next prime is 81173866153. The reversal of 81173866151 is 15166837118.

It is a cyclic number.

It is not a de Polignac number, because 81173866151 - 2¹⁰ = 81173865127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81173866096 and 81173866105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81173866153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 511181 + ... + 650886.

It is an arithmetic number, because the mean of its divisors is an integer number (6149663856).

Almost surely, 2^81173866151 is an apocalyptic number.

81173866151 is a deficient number, since it is larger than the sum of its proper divisors (17220755545).

81173866151 is a wasteful number, since it uses less digits than its factorization.

81173866151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162678.

The product of its digits is 241920, while the sum is 47.

The spelling of 81173866151 in words is "eighty-one billion, one hundred seventy-three million, eight hundred sixty-six thousand, one hundred fifty-one".