1255820077440 has 512 divisors, whose sum is σ = 4559513587200. Its totient is φ = 326495232000.

The previous prime is 1255820077427. The next prime is 1255820077441. The reversal of 1255820077440 is 447700285521.

1255820077440 is a `hidden beast` number, since 1 + 2 + 558 + 20 + 0 + 7 + 74 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255820077441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 520869835 + ... + 520872245.

It is an arithmetic number, because the mean of its divisors is an integer number (8905299975).

Almost surely, 2^{1255820077440} is an apocalyptic number.

1255820077440 is a gapful number since it is divisible by the number (10) 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 1255820077440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2279756793600).

1255820077440 is an abundant number, since it is smaller than the sum of its proper divisors (3303693509760).

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

1255820077440 is a wasteful number, since it uses less digits than its factorization.

1255820077440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183 (or 3165 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 45.

The spelling of 1255820077440 in words is "one trillion, two hundred fifty-five billion, eight hundred twenty million, seventy-seven thousand, four hundred forty".