168983906137 has 4 divisors (see below), whose sum is σ = 169214444260. Its totient is φ = 168753368016.

The previous prime is 168983906131. The next prime is 168983906149. The reversal of 168983906137 is 731609389861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152368438336 + 16615467801 = 390344^2 + 128901^2 .

It is a cyclic number.

It is not a de Polignac number, because 168983906137 - 2¹⁵ = 168983873369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168983906131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115267962 + ... + 115269427.

It is an arithmetic number, because the mean of its divisors is an integer number (42303611065).

Almost surely, 2^168983906137 is an apocalyptic number.

It is an amenable number.

168983906137 is a deficient number, since it is larger than the sum of its proper divisors (230538123).

168983906137 is an equidigital number, since it uses as much as digits as its factorization.

168983906137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230538122.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 168983906137 in words is "one hundred sixty-eight billion, nine hundred eighty-three million, nine hundred six thousand, one hundred thirty-seven".