167656399121 has 2 divisors, whose sum is σ = 167656399122. Its totient is φ = 167656399120.

The previous prime is 167656399117. The next prime is 167656399123. The reversal of 167656399121 is 121993656761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147160468225 + 20495930896 = 383615^2 + 143164^2 .

It is a cyclic number.

It is not a de Polignac number, because 167656399121 - 2² = 167656399117 is a prime.

It is a Sophie Germain prime.

Together with 167656399123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (167656399123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83828199560 + 83828199561.

It is an arithmetic number, because the mean of its divisors is an integer number (83828199561).

Almost surely, 2^167656399121 is an apocalyptic number.

It is an amenable number.

167656399121 is a deficient number, since it is larger than the sum of its proper divisors (1).

167656399121 is an equidigital number, since it uses as much as digits as its factorization.

167656399121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The spelling of 167656399121 in words is "one hundred sixty-seven billion, six hundred fifty-six million, three hundred ninety-nine thousand, one hundred twenty-one".