161655713 has 4 divisors (see below), whose sum is σ = 161908548. Its totient is φ = 161402880.

The previous prime is 161655709. The next prime is 161655727. The reversal of 161655713 is 317556161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147306769 + 14348944 = 12137^2 + 3788^2 .

It is a cyclic number.

It is not a de Polignac number, because 161655713 - 2² = 161655709 is a prime.

It is a super-2 number, since 2×161655713² = 52265139091076738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161655733) 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, 125456 + ... + 126737.

It is an arithmetic number, because the mean of its divisors is an integer number (40477137).

Almost surely, 2^161655713 is an apocalyptic number.

It is an amenable number.

161655713 is a deficient number, since it is larger than the sum of its proper divisors (252835).

161655713 is an equidigital number, since it uses as much as digits as its factorization.

161655713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252834.

The product of its digits is 18900, while the sum is 35.

The square root of 161655713 is about 12714.3899971646. The cubic root of 161655713 is about 544.7497243248.

The spelling of 161655713 in words is "one hundred sixty-one million, six hundred fifty-five thousand, seven hundred thirteen".