1265163057 has 20 divisors (see below), whose sum is σ = 1899750820. Its totient is φ = 839061504.

The previous prime is 1265163043. The next prime is 1265163059. The reversal of 1265163057 is 7503615621.

1265163057 is a `hidden beast` number, since 12 + 6 + 5 + 1 + 630 + 5 + 7 = 666.

1265163057 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 597509136 + 667653921 = 24444^2 + 25839^2 .

It is not a de Polignac number, because 1265163057 - 2⁶ = 1265162993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265163059) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24832 + ... + 56097.

It is an arithmetic number, because the mean of its divisors is an integer number (94987541).

Almost surely, 2^1265163057 is an apocalyptic number.

It is an amenable number.

1265163057 is a deficient number, since it is larger than the sum of its proper divisors (634587763).

1265163057 is an equidigital number, since it uses as much as digits as its factorization.

1265163057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81134 (or 81125 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 1265163057 is about 35569.1306753483. The cubic root of 1265163057 is about 1081.5555593272. Note that the first 5 decimals are identical.

Adding to 1265163057 its reverse (7503615621), we get a palindrome (8768778678).

The spelling of 1265163057 in words is "one billion, two hundred sixty-five million, one hundred sixty-three thousand, fifty-seven".