1265506056 has 96 divisors (see below), whose sum is σ = 3583257600. Its totient is φ = 403004160.

The previous prime is 1265506019. The next prime is 1265506057. The reversal of 1265506056 is 6506055621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1265506056.

It is not an unprimeable number, because it can be changed into a prime (1265506057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172740 + ... + 179916.

It is an arithmetic number, because the mean of its divisors is an integer number (37325600).

Almost surely, 2^1265506056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265506056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1791628800).

1265506056 is an abundant number, since it is smaller than the sum of its proper divisors (2317751544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265506056 is a wasteful number, since it uses less digits than its factorization.

1265506056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299 (or 7292 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 1265506056 is about 35573.9519311532. The cubic root of 1265506056 is about 1081.6532908551.

The spelling of 1265506056 in words is "one billion, two hundred sixty-five million, five hundred six thousand, fifty-six".