81082637169 has 8 divisors (see below), whose sum is σ = 109412715552. Its totient is φ = 53403825120.

The previous prime is 81082637143. The next prime is 81082637189. The reversal of 81082637169 is 96173628018.

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

It is not a de Polignac number, because 81082637169 - 2²⁰ = 81081588593 is a prime.

It is a super-2 number, since 2×81082637169² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81082637189) 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, 162816292 + ... + 162816789.

It is an arithmetic number, because the mean of its divisors is an integer number (13676589444).

Almost surely, 2^81082637169 is an apocalyptic number.

It is an amenable number.

81082637169 is a deficient number, since it is larger than the sum of its proper divisors (28330078383).

81082637169 is a wasteful number, since it uses less digits than its factorization.

81082637169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325633167.

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 81082637169 in words is "eighty-one billion, eighty-two million, six hundred thirty-seven thousand, one hundred sixty-nine".