81914040165 has 8 divisors (see below), whose sum is σ = 131062464288. Its totient is φ = 43687488080.

The previous prime is 81914040151. The next prime is 81914040317. The reversal of 81914040165 is 56104041918.

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

It is not a de Polignac number, because 81914040165 - 2¹⁴ = 81914023781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2730467991 + ... + 2730468020.

It is an arithmetic number, because the mean of its divisors is an integer number (16382808036).

Almost surely, 2^81914040165 is an apocalyptic number.

It is an amenable number.

81914040165 is a deficient number, since it is larger than the sum of its proper divisors (49148424123).

81914040165 is a wasteful number, since it uses less digits than its factorization.

81914040165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460936019.

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 81914040165 in words is "eighty-one billion, nine hundred fourteen million, forty thousand, one hundred sixty-five".