1265772245 has 4 divisors (see below), whose sum is σ = 1518926700. Its totient is φ = 1012617792.

The previous prime is 1265772239. The next prime is 1265772259. The reversal of 1265772245 is 5422775621.

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 233692369 + 1032079876 = 15287^2 + 32126^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265772245 - 2⁸ = 1265771989 is a prime.

It is a congruent number.

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, 126577220 + ... + 126577229.

It is an arithmetic number, because the mean of its divisors is an integer number (379731675).

Almost surely, 2^1265772245 is an apocalyptic number.

It is an amenable number.

1265772245 is a deficient number, since it is larger than the sum of its proper divisors (253154455).

1265772245 is an equidigital number, since it uses as much as digits as its factorization.

1265772245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253154454.

The product of its digits is 235200, while the sum is 41.

The square root of 1265772245 is about 35577.6930814801. The cubic root of 1265772245 is about 1081.7291245558.

The spelling of 1265772245 in words is "one billion, two hundred sixty-five million, seven hundred seventy-two thousand, two hundred forty-five".