265640629 has 2 divisors, whose sum is σ = 265640630. Its totient is φ = 265640628.

The previous prime is 265640603. The next prime is 265640633. The reversal of 265640629 is 926046562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233264529 + 32376100 = 15273^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 265640629 - 2²⁷ = 131422901 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 265640591 and 265640600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265640659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132820314 + 132820315.

It is an arithmetic number, because the mean of its divisors is an integer number (132820315).

Almost surely, 2^265640629 is an apocalyptic number.

It is an amenable number.

265640629 is a deficient number, since it is larger than the sum of its proper divisors (1).

265640629 is an equidigital number, since it uses as much as digits as its factorization.

265640629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 265640629 is about 16298.4854817863. The cubic root of 265640629 is about 642.8330049655.

The spelling of 265640629 in words is "two hundred sixty-five million, six hundred forty thousand, six hundred twenty-nine".