255551213211520 has 128 divisors (see below), whose sum is σ = 649268714793600. Its totient is φ = 95849865707520.

The previous prime is 255551213211499. The next prime is 255551213211529. The reversal of 255551213211520 is 25112312155552.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255551213211529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40731576 + ... + 46585015.

It is an arithmetic number, because the mean of its divisors is an integer number (5072411834325).

Almost surely, 2^{255551213211520} is an apocalyptic number.

255551213211520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255551213211520 is an abundant number, since it is smaller than the sum of its proper divisors (393717501582080).

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

255551213211520 is a wasteful number, since it uses less digits than its factorization.

255551213211520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87316896 (or 87316884 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 40.

The spelling of 255551213211520 in words is "two hundred fifty-five trillion, five hundred fifty-one billion, two hundred thirteen million, two hundred eleven thousand, five hundred twenty".