1265650056 has 128 divisors (see below), whose sum is σ = 3888374400. Its totient is φ = 378224640.

The previous prime is 1265650039. The next prime is 1265650093. The reversal of 1265650056 is 6500565621.

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 1265650056.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169800 + ... + 177096.

It is an arithmetic number, because the mean of its divisors is an integer number (30377925).

Almost surely, 2^1265650056 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 1265650056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944187200).

1265650056 is an abundant number, since it is smaller than the sum of its proper divisors (2622724344).

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

1265650056 is a wasteful number, since it uses less digits than its factorization.

1265650056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7396 (or 7386 counting only the distinct ones).

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

The square root of 1265650056 is about 35575.9758263916. The cubic root of 1265650056 is about 1081.6943158573.

The spelling of 1265650056 in words is "one billion, two hundred sixty-five million, six hundred fifty thousand, fifty-six".