1265120631616 has 28 divisors (see below), whose sum is σ = 2510515090720. Its totient is φ = 632549900160.

The previous prime is 1265120631601. The next prime is 1265120631653. The reversal of 1265120631616 is 6161360215621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5047501 + ... + 5292211.

It is an arithmetic number, because the mean of its divisors is an integer number (89661253240).

Almost surely, 2^{1265120631616} is an apocalyptic number.

1265120631616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1265120631616 is a deficient number, since it is larger than the sum of its proper divisors (1245394459104).

1265120631616 is an equidigital number, since it uses as much as digits as its factorization.

1265120631616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325502 (or 325492 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 1265120631616 in words is "one trillion, two hundred sixty-five billion, one hundred twenty million, six hundred thirty-one thousand, six hundred sixteen".