161666152 has 8 divisors (see below), whose sum is σ = 303124050. Its totient is φ = 80833072.

The previous prime is 161666137. The next prime is 161666189. The reversal of 161666152 is 251666161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 103510276 + 58155876 = 10174^2 + 7626^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161666152² = 52271889404974208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104127 + ... + 10104142.

Almost surely, 2^161666152 is an apocalyptic number.

It is an amenable number.

161666152 is a deficient number, since it is larger than the sum of its proper divisors (141457898).

161666152 is a wasteful number, since it uses less digits than its factorization.

161666152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20208275 (or 20208271 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 161666152 is about 12714.8005096423. The cubic root of 161666152 is about 544.7614499027.

Subtracting 161666152 from its reverse (251666161), we obtain a palindrome (90000009).

The spelling of 161666152 in words is "one hundred sixty-one million, six hundred sixty-six thousand, one hundred fifty-two".