1265897653 has 2 divisors, whose sum is σ = 1265897654. Its totient is φ = 1265897652.

The previous prime is 1265897651. The next prime is 1265897729. The reversal of 1265897653 is 3567985621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1265722929 + 174724 = 35577^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265897653 - 2¹ = 1265897651 is a prime.

Together with 1265897651, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1265897653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265897651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632948826 + 632948827.

It is an arithmetic number, because the mean of its divisors is an integer number (632948827).

Almost surely, 2^1265897653 is an apocalyptic number.

It is an amenable number.

1265897653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265897653 is an equidigital number, since it uses as much as digits as its factorization.

1265897653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 52.

The square root of 1265897653 is about 35579.4554904934. The cubic root of 1265897653 is about 1081.7648479404.

The spelling of 1265897653 in words is "one billion, two hundred sixty-five million, eight hundred ninety-seven thousand, six hundred fifty-three".