260664139 has 2 divisors, whose sum is σ = 260664140. Its totient is φ = 260664138.

The previous prime is 260664137. The next prime is 260664161. The reversal of 260664139 is 931466062.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 260664139 - 2¹ = 260664137 is a prime.

It is a super-2 number, since 2×260664139² = 135891586721222642, which contains 22 as substring.

Together with 260664137, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 260664098 and 260664107.

It is not a weakly prime, because it can be changed into another prime (260664137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130332069 + 130332070.

It is an arithmetic number, because the mean of its divisors is an integer number (130332070).

Almost surely, 2^260664139 is an apocalyptic number.

260664139 is a deficient number, since it is larger than the sum of its proper divisors (1).

260664139 is an equidigital number, since it uses as much as digits as its factorization.

260664139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 260664139 is about 16145.0964382378. The cubic root of 260664139 is about 638.7934126945.

The spelling of 260664139 in words is "two hundred sixty million, six hundred sixty-four thousand, one hundred thirty-nine".