1261544523233 has 4 divisors (see below), whose sum is σ = 1264628984580. Its totient is φ = 1258460061888.

The previous prime is 1261544523227. The next prime is 1261544523247. The reversal of 1261544523233 is 3323254451621.

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 1104710306704 + 156834216529 = 1051052^2 + 396023^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261544523233 - 2³⁸ = 986666616289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261544522233) 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, 1542230060 + ... + 1542230877.

It is an arithmetic number, because the mean of its divisors is an integer number (316157246145).

Almost surely, 2^{1261544523233} is an apocalyptic number.

It is an amenable number.

1261544523233 is a deficient number, since it is larger than the sum of its proper divisors (3084461347).

1261544523233 is an equidigital number, since it uses as much as digits as its factorization.

1261544523233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084461346.

The product of its digits is 518400, while the sum is 41.

Adding to 1261544523233 its reverse (3323254451621), we get a palindrome (4584798974854).

The spelling of 1261544523233 in words is "one trillion, two hundred sixty-one billion, five hundred forty-four million, five hundred twenty-three thousand, two hundred thirty-three".