165284225581 has 8 divisors (see below), whose sum is σ = 166958117784. Its totient is φ = 163611067200.

The previous prime is 165284225549. The next prime is 165284225593. The reversal of 165284225581 is 185522482561.

It can be written as a sum of positive squares in 4 ways, for example, as 22180144900 + 143104080681 = 148930^2 + 378291^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 165284225581 - 2⁵ = 165284225549 is a prime.

It is a super-2 number, since 2×165284225581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165284225501) 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, 275071 + ... + 637363.

It is an arithmetic number, because the mean of its divisors is an integer number (20869764723).

Almost surely, 2^165284225581 is an apocalyptic number.

It is an amenable number.

165284225581 is a deficient number, since it is larger than the sum of its proper divisors (1673892203).

165284225581 is a wasteful number, since it uses less digits than its factorization.

165284225581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366911.

The product of its digits is 1536000, while the sum is 49.

The spelling of 165284225581 in words is "one hundred sixty-five billion, two hundred eighty-four million, two hundred twenty-five thousand, five hundred eighty-one".