1265506716320 has 144 divisors (see below), whose sum is σ = 3794055134688. Its totient is φ = 394443624960.

The previous prime is 1265506716191. The next prime is 1265506716329. The reversal of 1265506716320 is 236176055621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (1265506716329) 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, 7250882 + ... + 7423361.

It is an arithmetic number, because the mean of its divisors is an integer number (26347605102).

Almost surely, 2^{1265506716320} is an apocalyptic number.

1265506716320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265506716320 is an abundant number, since it is smaller than the sum of its proper divisors (2528548418368).

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

1265506716320 is a wasteful number, since it uses less digits than its factorization.

1265506716320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14674283 (or 14674268 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 1265506716320 in words is "one trillion, two hundred sixty-five billion, five hundred six million, seven hundred sixteen thousand, three hundred twenty".