161703557 has 2 divisors, whose sum is σ = 161703558. Its totient is φ = 161703556.

The previous prime is 161703551. The next prime is 161703589. The reversal of 161703557 is 755307161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161442436 + 261121 = 12706^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 161703557 - 2⁸ = 161703301 is a prime.

It is a super-2 number, since 2×161703557² = 52296080692904498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161703551) 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, 80851778 + 80851779.

It is an arithmetic number, because the mean of its divisors is an integer number (80851779).

Almost surely, 2^161703557 is an apocalyptic number.

It is an amenable number.

161703557 is a deficient number, since it is larger than the sum of its proper divisors (1).

161703557 is an equidigital number, since it uses as much as digits as its factorization.

161703557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 161703557 is about 12716.2713481586. The cubic root of 161703557 is about 544.8034608214.

The spelling of 161703557 in words is "one hundred sixty-one million, seven hundred three thousand, five hundred fifty-seven".