1265550697 has 2 divisors, whose sum is σ = 1265550698. Its totient is φ = 1265550696.

The previous prime is 1265550679. The next prime is 1265550743. The reversal of 1265550697 is 7960555621.

Together with previous prime (1265550679) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (1265550743) can be obtained adding 1265550697 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650709081 + 614841616 = 25509^2 + 24796^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265550697 - 2¹⁹ = 1265026409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265553697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632775348 + 632775349.

It is an arithmetic number, because the mean of its divisors is an integer number (632775349).

Almost surely, 2^1265550697 is an apocalyptic number.

It is an amenable number.

1265550697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265550697 is an equidigital number, since it uses as much as digits as its factorization.

1265550697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 46.

The square root of 1265550697 is about 35574.5793650466. The cubic root of 1265550697 is about 1081.6660092235. Note that the first 3 decimals are identical.

The spelling of 1265550697 in words is "one billion, two hundred sixty-five million, five hundred fifty thousand, six hundred ninety-seven".