1265620063 has 4 divisors (see below), whose sum is σ = 1340068320. Its totient is φ = 1191171808.

The previous prime is 1265620051. The next prime is 1265620127. The reversal of 1265620063 is 3600265621.

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

It is a cyclic number.

It is not a de Polignac number, because 1265620063 - 2²⁵ = 1232065631 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 (1265620003) 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, 37224103 + ... + 37224136.

It is an arithmetic number, because the mean of its divisors is an integer number (335017080).

Almost surely, 2^1265620063 is an apocalyptic number.

1265620063 is a deficient number, since it is larger than the sum of its proper divisors (74448257).

1265620063 is an equidigital number, since it uses as much as digits as its factorization.

1265620063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74448256.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1265620063 is about 35575.5542894275. The cubic root of 1265620063 is about 1081.6857712327.

Adding to 1265620063 its reverse (3600265621), we get a palindrome (4865885684).

The spelling of 1265620063 in words is "one billion, two hundred sixty-five million, six hundred twenty thousand, sixty-three".