1265816916322 has 16 divisors (see below), whose sum is σ = 2170507881600. Its totient is φ = 542358957888.

The previous prime is 1265816916293. The next prime is 1265816916341. The reversal of 1265816916322 is 2236196185621.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1265816916322.

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 7 ways as a sum of consecutive naturals, for example, 11108478 + ... + 11221849.

It is an arithmetic number, because the mean of its divisors is an integer number (135656742600).

Almost surely, 2^{1265816916322} is an apocalyptic number.

1265816916322 is a deficient number, since it is larger than the sum of its proper divisors (904690965278).

1265816916322 is a wasteful number, since it uses less digits than its factorization.

1265816916322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22334385.

The product of its digits is 1866240, while the sum is 52.

The spelling of 1265816916322 in words is "one trillion, two hundred sixty-five billion, eight hundred sixteen million, nine hundred sixteen thousand, three hundred twenty-two".