1265116345 has 4 divisors (see below), whose sum is σ = 1518139620. Its totient is φ = 1012093072.

The previous prime is 1265116313. The next prime is 1265116361. The reversal of 1265116345 is 5436115621.

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 476854569 + 788261776 = 21837^2 + 28076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265116345 - 2⁵ = 1265116313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265116345.

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, 126511630 + ... + 126511639.

It is an arithmetic number, because the mean of its divisors is an integer number (379534905).

Almost surely, 2^1265116345 is an apocalyptic number.

It is an amenable number.

1265116345 is a deficient number, since it is larger than the sum of its proper divisors (253023275).

1265116345 is an equidigital number, since it uses as much as digits as its factorization.

1265116345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253023274.

The product of its digits is 21600, while the sum is 34.

The square root of 1265116345 is about 35568.4740324912. The cubic root of 1265116345 is about 1081.5422481985.

The spelling of 1265116345 in words is "one billion, two hundred sixty-five million, one hundred sixteen thousand, three hundred forty-five".