161736667 has 4 divisors (see below), whose sum is σ = 168768720. Its totient is φ = 154704616.

The previous prime is 161736649. The next prime is 161736671. The reversal of 161736667 is 766637161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766637161 = 31 ⋅24730231.

It is a cyclic number.

It is not a de Polignac number, because 161736667 - 2¹¹ = 161734619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161736637) 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, 3515992 + ... + 3516037.

It is an arithmetic number, because the mean of its divisors is an integer number (42192180).

Almost surely, 2^161736667 is an apocalyptic number.

161736667 is a deficient number, since it is larger than the sum of its proper divisors (7032053).

161736667 is an equidigital number, since it uses as much as digits as its factorization.

161736667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032052.

The product of its digits is 190512, while the sum is 43.

The square root of 161736667 is about 12717.5731568566. The cubic root of 161736667 is about 544.8406424639.

The spelling of 161736667 in words is "one hundred sixty-one million, seven hundred thirty-six thousand, six hundred sixty-seven".