161664137 has 8 divisors (see below), whose sum is σ = 166210176. Its totient is φ = 157127472.

The previous prime is 161664127. The next prime is 161664143. The reversal of 161664137 is 731466161.

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 161664137 - 2⁸ = 161663881 is a prime.

It is a super-2 number, since 2×161664137² = 52270586383909538, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161664097 and 161664106.

It is not an unprimeable number, because it can be changed into a prime (161664127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46688 + ... + 50030.

It is an arithmetic number, because the mean of its divisors is an integer number (20776272).

Almost surely, 2^161664137 is an apocalyptic number.

It is an amenable number.

161664137 is a deficient number, since it is larger than the sum of its proper divisors (4546039).

161664137 is a wasteful number, since it uses less digits than its factorization.

161664137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4687.

The product of its digits is 18144, while the sum is 35.

The square root of 161664137 is about 12714.7212710307. The cubic root of 161664137 is about 544.7591865988.

The spelling of 161664137 in words is "one hundred sixty-one million, six hundred sixty-four thousand, one hundred thirty-seven".