161375552251 has 2 divisors, whose sum is σ = 161375552252. Its totient is φ = 161375552250.

The previous prime is 161375552249. The next prime is 161375552357. The reversal of 161375552251 is 152255573161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161375552251 - 2¹ = 161375552249 is a prime.

Together with 161375552249, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161375552198 and 161375552207.

It is not a weakly prime, because it can be changed into another prime (161375552201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80687776125 + 80687776126.

It is an arithmetic number, because the mean of its divisors is an integer number (80687776126).

Almost surely, 2^161375552251 is an apocalyptic number.

161375552251 is a deficient number, since it is larger than the sum of its proper divisors (1).

161375552251 is an equidigital number, since it uses as much as digits as its factorization.

161375552251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 315000, while the sum is 43.

The spelling of 161375552251 in words is "one hundred sixty-one billion, three hundred seventy-five million, five hundred fifty-two thousand, two hundred fifty-one".