1265801633 has 4 divisors (see below), whose sum is σ = 1272227220. Its totient is φ = 1259376048.

The previous prime is 1265801627. The next prime is 1265801659. The reversal of 1265801633 is 3361085621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1173199504 + 92602129 = 34252^2 + 9623^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265801633 - 2²⁸ = 997366177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1265801593 and 1265801602.

It is not an unprimeable number, because it can be changed into a prime (1265801683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3212498 + ... + 3212891.

It is an arithmetic number, because the mean of its divisors is an integer number (318056805).

Almost surely, 2^1265801633 is an apocalyptic number.

It is an amenable number.

1265801633 is a deficient number, since it is larger than the sum of its proper divisors (6425587).

1265801633 is an equidigital number, since it uses as much as digits as its factorization.

1265801633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425586.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1265801633 is about 35578.1060906845. The cubic root of 1265801633 is about 1081.7374961539.

The spelling of 1265801633 in words is "one billion, two hundred sixty-five million, eight hundred one thousand, six hundred thirty-three".