1255335213520 has 40 divisors (see below), whose sum is σ = 2947551958440. Its totient is φ = 497162457600.

The previous prime is 1255335213511. The next prime is 1255335213527. The reversal of 1255335213520 is 253125335521.

It can be written as a sum of positive squares in 4 ways, for example, as 523324921744 + 732010291776 = 723412^2 + 855576^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1255335213520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255335213527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77673555 + ... + 77689714.

It is an arithmetic number, because the mean of its divisors is an integer number (73688798961).

Almost surely, 2^{1255335213520} is an apocalyptic number.

1255335213520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255335213520 is an abundant number, since it is smaller than the sum of its proper divisors (1692216744920).

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

1255335213520 is a wasteful number, since it uses less digits than its factorization.

1255335213520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155363383 (or 155363377 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 37.

The spelling of 1255335213520 in words is "one trillion, two hundred fifty-five billion, three hundred thirty-five million, two hundred thirteen thousand, five hundred twenty".