168844562649 has 81 divisors (see below), whose sum is σ = 301637070111. Its totient is φ = 90728265600.

The previous prime is 168844562647. The next prime is 168844562693. The reversal of 168844562649 is 946265448861.

The square root of 168844562649 is 410907.

It is a perfect power (a square), and thus also a powerful number.

168844562649 is a `hidden beast` number, since 1 + 6 + 8 + 8 + 4 + 4 + 562 + 64 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 131453379225 + 37391183424 = 362565^2 + 193368^2 .

It is not a de Polignac number, because 168844562649 - 2¹ = 168844562647 is a prime.

It is a super-2 number, since 2×168844562649² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168844562647) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 146693224 + ... + 146694374.

Almost surely, 2^168844562649 is an apocalyptic number.

168844562649 is the 410907-th square number.

168844562649 is the 205454-th centered octagonal number.

It is an amenable number.

168844562649 is a deficient number, since it is larger than the sum of its proper divisors (132792507462).

168844562649 is an equidigital number, since it uses as much as digits as its factorization.

168844562649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356 (or 1178 counting only the distinct ones).

The product of its digits is 79626240, while the sum is 63.

The spelling of 168844562649 in words is "one hundred sixty-eight billion, eight hundred forty-four million, five hundred sixty-two thousand, six hundred forty-nine".