1055121209856 has 480 divisors, whose sum is σ = 3628535758848. Its totient is φ = 299837583360.

The previous prime is 1055121209837. The next prime is 1055121209861. The reversal of 1055121209856 is 6589021215501.

1055121209856 is a `hidden beast` number, since 1 + 0 + 5 + 512 + 120 + 9 + 8 + 5 + 6 = 666.

It is a super-2 number, since 2×1055121209856² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166341021 + ... + 166347363.

Almost surely, 2^{1055121209856} is an apocalyptic number.

1055121209856 is a gapful number since it is divisible by the number (16) 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 1055121209856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814267879424).

1055121209856 is an abundant number, since it is smaller than the sum of its proper divisors (2573414548992).

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

1055121209856 is an frugal number, since it uses more digits than its factorization.

1055121209856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6574 (or 6546 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 45.

The spelling of 1055121209856 in words is "one trillion, fifty-five billion, one hundred twenty-one million, two hundred nine thousand, eight hundred fifty-six".