81669118371 has 8 divisors (see below), whose sum is σ = 108897888960. Its totient is φ = 54443213352.

The previous prime is 81669118351. The next prime is 81669118373. The reversal of 81669118371 is 17381196618.

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

It is not a de Polignac number, because 81669118371 - 2⁵ = 81669118339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81669118373) 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, 648985 + ... + 764538.

It is an arithmetic number, because the mean of its divisors is an integer number (13612236120).

Almost surely, 2^81669118371 is an apocalyptic number.

81669118371 is a deficient number, since it is larger than the sum of its proper divisors (27228770589).

81669118371 is a wasteful number, since it uses less digits than its factorization.

81669118371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432785.

The product of its digits is 435456, while the sum is 51.

The spelling of 81669118371 in words is "eighty-one billion, six hundred sixty-nine million, one hundred eighteen thousand, three hundred seventy-one".