1265491968 has 224 divisors, whose sum is σ = 3864290976. Its totient is φ = 364904448.

The previous prime is 1265491961. The next prime is 1265491987. The reversal of 1265491968 is 8691945621.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 1265491968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265491961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5431180 + ... + 5431412.

It is an arithmetic number, because the mean of its divisors is an integer number (17251299).

Almost surely, 2^1265491968 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 1265491968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932145488).

1265491968 is an abundant number, since it is smaller than the sum of its proper divisors (2598799008).

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

1265491968 is a wasteful number, since it uses less digits than its factorization.

1265491968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 268 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 1265491968 is about 35573.7539205522. The cubic root of 1265491968 is about 1081.6492770752.

The spelling of 1265491968 in words is "one billion, two hundred sixty-five million, four hundred ninety-one thousand, nine hundred sixty-eight".