82171790045 has 16 divisors (see below), whose sum is σ = 103919760000. Its totient is φ = 62203278528.

The previous prime is 82171790033. The next prime is 82171790047. The reversal of 82171790045 is 54009717128.

It is a cyclic number.

It is not a de Polignac number, because 82171790045 - 2⁶ = 82171789981 is a prime.

It is a super-2 number, since 2×82171790045² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 82171789978 and 82171790005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82171790047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435770 + ... + 595179.

It is an arithmetic number, because the mean of its divisors is an integer number (6494985000).

Almost surely, 2^82171790045 is an apocalyptic number.

It is an amenable number.

82171790045 is a deficient number, since it is larger than the sum of its proper divisors (21747969955).

82171790045 is a wasteful number, since it uses less digits than its factorization.

82171790045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031812.

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 82171790045 in words is "eighty-two billion, one hundred seventy-one million, seven hundred ninety thousand, forty-five".