81697715229 has 32 divisors (see below), whose sum is σ = 117915952000. Its totient is φ = 50016061440.

The previous prime is 81697715221. The next prime is 81697715279. The reversal of 81697715229 is 92251779618.

It is not a de Polignac number, because 81697715229 - 2³ = 81697715221 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 (81697715221) 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, 10607622 + ... + 10615320.

It is an arithmetic number, because the mean of its divisors is an integer number (3684873500).

Almost surely, 2^81697715229 is an apocalyptic number.

It is an amenable number.

81697715229 is a deficient number, since it is larger than the sum of its proper divisors (36218236771).

81697715229 is a wasteful number, since it uses less digits than its factorization.

81697715229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9085.

The product of its digits is 3810240, while the sum is 57.

The spelling of 81697715229 in words is "eighty-one billion, six hundred ninety-seven million, seven hundred fifteen thousand, two hundred twenty-nine".