1265220356 has 12 divisors (see below), whose sum is σ = 2215141068. Its totient is φ = 632322912.

The previous prime is 1265220349. The next prime is 1265220403. The reversal of 1265220356 is 6530225621.

It can be written as a sum of positive squares in 2 ways, for example, as 1125602500 + 139617856 = 33550^2 + 11816^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61751 + ... + 79646.

It is an arithmetic number, because the mean of its divisors is an integer number (184595089).

Almost surely, 2^1265220356 is an apocalyptic number.

It is an amenable number.

1265220356 is a deficient number, since it is larger than the sum of its proper divisors (949920712).

1265220356 is a wasteful number, since it uses less digits than its factorization.

1265220356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143638 (or 143636 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 1265220356 is about 35569.9361258915. The cubic root of 1265220356 is about 1081.5718868976.

Adding to 1265220356 its reverse (6530225621), we get a palindrome (7795445977).

The spelling of 1265220356 in words is "one billion, two hundred sixty-five million, two hundred twenty thousand, three hundred fifty-six".