1255521272544 has 1728 divisors, whose sum is σ = 4997047910400. Its totient is φ = 302633210880.

The previous prime is 1255521272531. The next prime is 1255521272549. The reversal of 1255521272544 is 4452721255521.

1255521272544 is a `hidden beast` number, since 1 + 2 + 5 + 5 + 521 + 2 + 72 + 54 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1255521272544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255521272549) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 9885994209 + ... + 9885994335.

Almost surely, 2^{1255521272544} is an apocalyptic number.

1255521272544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255521272544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2498523955200).

1255521272544 is an abundant number, since it is smaller than the sum of its proper divisors (3741526637856).

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

1255521272544 is a wasteful number, since it uses less digits than its factorization.

1255521272544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 248 counting only the distinct ones).

The product of its digits is 1120000, while the sum is 45.

The spelling of 1255521272544 in words is "one trillion, two hundred fifty-five billion, five hundred twenty-one million, two hundred seventy-two thousand, five hundred forty-four".