161707057 has 4 divisors (see below), whose sum is σ = 166077556. Its totient is φ = 157336560.

The previous prime is 161707033. The next prime is 161707061. The reversal of 161707057 is 750707161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750707161 = 6607 ⋅113623.

It can be written as a sum of positive squares in 2 ways, for example, as 109809441 + 51897616 = 10479^2 + 7204^2 .

It is a cyclic number.

It is not a de Polignac number, because 161707057 - 2²³ = 153318449 is a prime.

It is a super-2 number, since 2×161707057² = 52298344567202498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161704057) 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 in 3 ways as a sum of consecutive naturals, for example, 2185194 + ... + 2185267.

It is an arithmetic number, because the mean of its divisors is an integer number (41519389).

Almost surely, 2^161707057 is an apocalyptic number.

It is an amenable number.

161707057 is a deficient number, since it is larger than the sum of its proper divisors (4370499).

161707057 is an equidigital number, since it uses as much as digits as its factorization.

161707057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370498.

The product of its (nonzero) digits is 10290, while the sum is 34.

The square root of 161707057 is about 12716.4089663710. The cubic root of 161707057 is about 544.8073914674.

The spelling of 161707057 in words is "one hundred sixty-one million, seven hundred seven thousand, fifty-seven".