163225822581 has 6 divisors (see below), whose sum is σ = 235770632630. Its totient is φ = 108817215048.

The previous prime is 163225822561. The next prime is 163225822601. The reversal of 163225822581 is 185228522361.

163225822581 is a `hidden beast` number, since 1 + 63 + 2 + 2 + 5 + 8 + 2 + 2 + 581 = 666.

It is an interprime number because it is at equal distance from previous prime (163225822561) and next prime (163225822601).

It can be written as a sum of positive squares in only one way, i.e., 99385715025 + 63840107556 = 315255^2 + 252666^2 .

It is not a de Polignac number, because 163225822581 - 2⁶ = 163225822517 is a prime.

It is a super-2 number, since 2×163225822581² (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 (163225822561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9068101246 + ... + 9068101263.

Almost surely, 2^163225822581 is an apocalyptic number.

It is an amenable number.

163225822581 is a deficient number, since it is larger than the sum of its proper divisors (72544810049).

163225822581 is a wasteful number, since it uses less digits than its factorization.

163225822581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18136202515 (or 18136202512 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The spelling of 163225822581 in words is "one hundred sixty-three billion, two hundred twenty-five million, eight hundred twenty-two thousand, five hundred eighty-one".