1265888669 has 2 divisors, whose sum is σ = 1265888670. Its totient is φ = 1265888668.

The previous prime is 1265888621. The next prime is 1265888671. The reversal of 1265888669 is 9668885621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 928725625 + 337163044 = 30475^2 + 18362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265888669 - 2¹⁶ = 1265823133 is a prime.

It is a super-2 number, since 2×1265888669² = 3204948244605183122, which contains 22 as substring.

Together with 1265888671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265888269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632944334 + 632944335.

It is an arithmetic number, because the mean of its divisors is an integer number (632944335).

Almost surely, 2^1265888669 is an apocalyptic number.

It is an amenable number.

1265888669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265888669 is an equidigital number, since it uses as much as digits as its factorization.

1265888669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 59.

The square root of 1265888669 is about 35579.3292376346. The cubic root of 1265888669 is about 1081.7622888609.

The spelling of 1265888669 in words is "one billion, two hundred sixty-five million, eight hundred eighty-eight thousand, six hundred sixty-nine".