260020161 has 6 divisors (see below), whose sum is σ = 375584690. Its totient is φ = 173346768.

The previous prime is 260020147. The next prime is 260020171. The reversal of 260020161 is 161020062.

It is a happy number.

260020161 is a `hidden beast` number, since 2 + 600 + 2 + 0 + 1 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 159138225 + 100881936 = 12615^2 + 10044^2 .

It is a de Polignac number, because none of the positive numbers 2^k-260020161 is a prime.

It is a super-2 number, since 2×260020161² = 135220968252931842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260020141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14445556 + ... + 14445573.

Almost surely, 2^260020161 is an apocalyptic number.

It is an amenable number.

260020161 is a deficient number, since it is larger than the sum of its proper divisors (115564529).

260020161 is a wasteful number, since it uses less digits than its factorization.

260020161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28891135 (or 28891132 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 260020161 is about 16125.1406505494. The cubic root of 260020161 is about 638.2669265967.

Subtracting from 260020161 its reverse (161020062), we obtain a palindrome (99000099).

The spelling of 260020161 in words is "two hundred sixty million, twenty thousand, one hundred sixty-one".