1265223642173 has 4 divisors (see below), whose sum is σ = 1265328992928. Its totient is φ = 1265118291420.

The previous prime is 1265223642113. The next prime is 1265223642197. The reversal of 1265223642173 is 3712463225621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1265223642173 - 2⁸ = 1265223641917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265223642113) 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, 52657361 + ... + 52681382.

It is an arithmetic number, because the mean of its divisors is an integer number (316332248232).

Almost surely, 2^{1265223642173} is an apocalyptic number.

It is an amenable number.

1265223642173 is a deficient number, since it is larger than the sum of its proper divisors (105350755).

1265223642173 is a wasteful number, since it uses less digits than its factorization.

1265223642173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105350754.

The product of its digits is 725760, while the sum is 44.

Adding to 1265223642173 its reverse (3712463225621), we get a palindrome (4977686867794).

The spelling of 1265223642173 in words is "one trillion, two hundred sixty-five billion, two hundred twenty-three million, six hundred forty-two thousand, one hundred seventy-three".