161606517 has 4 divisors (see below), whose sum is σ = 215475360. Its totient is φ = 107737676.

The previous prime is 161606453. The next prime is 161606519. The reversal of 161606517 is 715606161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161606517 - 2⁶ = 161606453 is a prime.

It is a super-2 number, since 2×161606517² = 52233332673742578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26934417 + ... + 26934422.

It is an arithmetic number, because the mean of its divisors is an integer number (53868840).

Almost surely, 2^161606517 is an apocalyptic number.

It is an amenable number.

161606517 is a deficient number, since it is larger than the sum of its proper divisors (53868843).

161606517 is an equidigital number, since it uses as much as digits as its factorization.

161606517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53868842.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 161606517 is about 12712.4551916614. The cubic root of 161606517 is about 544.6944582576.

The spelling of 161606517 in words is "one hundred sixty-one million, six hundred six thousand, five hundred seventeen".