168081138625 has 32 divisors (see below), whose sum is σ = 211526808480. Its totient is φ = 133337881600.

The previous prime is 168081138619. The next prime is 168081138629. The reversal of 168081138625 is 526831180861.

It can be written as a sum of positive squares in 16 ways, for example, as 155672069809 + 12409068816 = 394553^2 + 111396^2 .

It is not a de Polignac number, because 168081138625 - 2²³ = 168072750017 is a prime.

It is a super-2 number, since 2×168081138625² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168081138629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17342781 + ... + 17352469.

It is an arithmetic number, because the mean of its divisors is an integer number (6610212765).

Almost surely, 2^168081138625 is an apocalyptic number.

It is an amenable number.

168081138625 is a deficient number, since it is larger than the sum of its proper divisors (43445669855).

168081138625 is a wasteful number, since it uses less digits than its factorization.

168081138625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10854 (or 10844 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 168081138625 in words is "one hundred sixty-eight billion, eighty-one million, one hundred thirty-eight thousand, six hundred twenty-five".