161268553 has 2 divisors, whose sum is σ = 161268554. Its totient is φ = 161268552.

The previous prime is 161268551. The next prime is 161268629. The reversal of 161268553 is 355862161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94633984 + 66634569 = 9728^2 + 8163^2 .

It is a cyclic number.

It is not a de Polignac number, because 161268553 - 2¹ = 161268551 is a prime.

Together with 161268551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161268551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80634276 + 80634277.

It is an arithmetic number, because the mean of its divisors is an integer number (80634277).

Almost surely, 2^161268553 is an apocalyptic number.

It is an amenable number.

161268553 is a deficient number, since it is larger than the sum of its proper divisors (1).

161268553 is an equidigital number, since it uses as much as digits as its factorization.

161268553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 37.

The square root of 161268553 is about 12699.1556018501. The cubic root of 161268553 is about 544.3144909222.

The spelling of 161268553 in words is "one hundred sixty-one million, two hundred sixty-eight thousand, five hundred fifty-three".