1265138890264 has 64 divisors (see below), whose sum is σ = 2511316684800. Its totient is φ = 596533766400.

The previous prime is 1265138890259. The next prime is 1265138890289. The reversal of 1265138890264 is 4620988315621.

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 15 ways as a sum of consecutive naturals, for example, 8661889 + ... + 8806735.

It is an arithmetic number, because the mean of its divisors is an integer number (39239323200).

Almost surely, 2^{1265138890264} is an apocalyptic number.

It is an amenable number.

1265138890264 is a deficient number, since it is larger than the sum of its proper divisors (1246177794536).

1265138890264 is a wasteful number, since it uses less digits than its factorization.

1265138890264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145784 (or 145780 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 1265138890264 in words is "one trillion, two hundred sixty-five billion, one hundred thirty-eight million, eight hundred ninety thousand, two hundred sixty-four".