66152161 has 4 divisors (see below), whose sum is σ = 68433300. Its totient is φ = 63871024.

The previous prime is 66152159. The next prime is 66152179. The reversal of 66152161 is 16125166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16125166 = 2 ⋅8062583.

It can be written as a sum of positive squares in 2 ways, for example, as 48385936 + 17766225 = 6956^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 66152161 - 2¹ = 66152159 is a prime.

It is a super-2 number, since 2×66152161² = 8752216809939842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66152111) 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, 1140526 + ... + 1140583.

It is an arithmetic number, because the mean of its divisors is an integer number (17108325).

Almost surely, 2^66152161 is an apocalyptic number.

It is an amenable number.

66152161 is a deficient number, since it is larger than the sum of its proper divisors (2281139).

66152161 is a wasteful number, since it uses less digits than its factorization.

66152161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281138.

The product of its digits is 2160, while the sum is 28.

The square root of 66152161 is about 8133.3978754270. The cubic root of 66152161 is about 404.4343289147.

The spelling of 66152161 in words is "sixty-six million, one hundred fifty-two thousand, one hundred sixty-one".