1255021560 has 256 divisors, whose sum is σ = 4572288000. Its totient is φ = 304335360.

The previous prime is 1255021451. The next prime is 1255021561. The reversal of 1255021560 is 651205521.

1255021560 is a `hidden beast` number, since 1 + 2 + 5 + 502 + 156 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255021561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 996211 + ... + 997469.

It is an arithmetic number, because the mean of its divisors is an integer number (17860500).

Almost surely, 2^1255021560 is an apocalyptic number.

1255021560 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 1255021560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2286144000).

1255021560 is an abundant number, since it is smaller than the sum of its proper divisors (3317266440).

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

1255021560 is a wasteful number, since it uses less digits than its factorization.

1255021560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1255021560 is about 35426.2834629883. The cubic root of 1255021560 is about 1078.6579007863.

The spelling of 1255021560 in words is "one billion, two hundred fifty-five million, twenty-one thousand, five hundred sixty".