165715871445 has 12 divisors (see below), whose sum is σ = 287240843916. Its totient is φ = 88381798080.

The previous prime is 165715871441. The next prime is 165715871459. The reversal of 165715871445 is 544178517561.

165715871445 is a `hidden beast` number, since 1 + 6 + 5 + 7 + 1 + 587 + 14 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 84309510321 + 81406361124 = 290361^2 + 285318^2 .

It is not a de Polignac number, because 165715871445 - 2² = 165715871441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165715871391 and 165715871400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165715871441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1841287416 + ... + 1841287505.

It is an arithmetic number, because the mean of its divisors is an integer number (23936736993).

Almost surely, 2^165715871445 is an apocalyptic number.

165715871445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165715871445 is a deficient number, since it is larger than the sum of its proper divisors (121524972471).

165715871445 is a wasteful number, since it uses less digits than its factorization.

165715871445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3682574932 (or 3682574929 counting only the distinct ones).

The product of its digits is 4704000, while the sum is 54.

The spelling of 165715871445 in words is "one hundred sixty-five billion, seven hundred fifteen million, eight hundred seventy-one thousand, four hundred forty-five".