161611705 has 8 divisors (see below), whose sum is σ = 196828992. Its totient is φ = 127359408.

The previous prime is 161611699. The next prime is 161611717. The reversal of 161611705 is 507116161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161611705 - 2⁹ = 161611193 is a prime.

It is a super-2 number, since 2×161611705² = 52236686386014050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240877 + ... + 241546.

It is an arithmetic number, because the mean of its divisors is an integer number (24603624).

Almost surely, 2^161611705 is an apocalyptic number.

It is an amenable number.

161611705 is a deficient number, since it is larger than the sum of its proper divisors (35217287).

161611705 is an equidigital number, since it uses as much as digits as its factorization.

161611705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482495.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 161611705 is about 12712.6592418738. The cubic root of 161611705 is about 544.7002869099.

Adding to 161611705 its reverse (507116161), we get a palindrome (668727866).

The spelling of 161611705 in words is "one hundred sixty-one million, six hundred eleven thousand, seven hundred five".