1265063203920 has 40 divisors (see below), whose sum is σ = 3921695932896. Its totient is φ = 337350187648.

The previous prime is 1265063203897. The next prime is 1265063203939. The reversal of 1265063203920 is 293023605621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2635548102 + ... + 2635548581.

Almost surely, 2^{1265063203920} is an apocalyptic number.

1265063203920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265063203920 is an abundant number, since it is smaller than the sum of its proper divisors (2656632728976).

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

1265063203920 is a wasteful number, since it uses less digits than its factorization.

1265063203920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271096699 (or 5271096693 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 1265063203920 in words is "one trillion, two hundred sixty-five billion, sixty-three million, two hundred three thousand, nine hundred twenty".