168381690625 has 24 divisors (see below), whose sum is σ = 210921984504. Its totient is φ = 134412000000.

The previous prime is 168381690619. The next prime is 168381690637. The reversal of 168381690625 is 526096183861.

It can be written as a sum of positive squares in 12 ways, for example, as 149122634896 + 19259055729 = 386164^2 + 138777^2 .

It is not a de Polignac number, because 168381690625 - 2²³ = 168373302017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1382185 + ... + 1499065.

It is an arithmetic number, because the mean of its divisors is an integer number (8788416021).

Almost surely, 2^168381690625 is an apocalyptic number.

It is an amenable number.

168381690625 is a deficient number, since it is larger than the sum of its proper divisors (42540293879).

168381690625 is an frugal number, since it uses more digits than its factorization.

168381690625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117367 (or 117347 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 168381690625 in words is "one hundred sixty-eight billion, three hundred eighty-one million, six hundred ninety thousand, six hundred twenty-five".