162666261 has 6 divisors (see below), whose sum is σ = 234962390. Its totient is φ = 108444168.

The previous prime is 162666241. The next prime is 162666263.

It is a happy number.

162666261 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 88172100 + 74494161 = 9390^2 + 8631^2 .

It is not a de Polignac number, because 162666261 - 2⁶ = 162666197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162666263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9037006 + ... + 9037023.

Almost surely, 2^162666261 is an apocalyptic number.

It is an amenable number.

162666261 is a deficient number, since it is larger than the sum of its proper divisors (72296129).

162666261 is a wasteful number, since it uses less digits than its factorization.

162666261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18074035 (or 18074032 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 162666261 is about 12754.0684097271. The cubic root of 162666261 is about 545.8824868865.

The spelling of 162666261 in words is "one hundred sixty-two million, six hundred sixty-six thousand, two hundred sixty-one".