10555551220 has 12 divisors (see below), whose sum is σ = 22166657604. Its totient is φ = 4222220480.

The previous prime is 10555551187. The next prime is 10555551233. The reversal of 10555551220 is 2215555501.

It can be written as a sum of positive squares in 2 ways, for example, as 7483288036 + 3072263184 = 86506^2 + 55428^2 .

It is a super-2 number, since 2×10555551220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263888761 + ... + 263888800.

It is an arithmetic number, because the mean of its divisors is an integer number (1847221467).

Almost surely, 2^10555551220 is an apocalyptic number.

10555551220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10555551220 is an abundant number, since it is smaller than the sum of its proper divisors (11611106384).

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

10555551220 is a wasteful number, since it uses less digits than its factorization.

10555551220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527777570 (or 527777568 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 31.

The spelling of 10555551220 in words is "ten billion, five hundred fifty-five million, five hundred fifty-one thousand, two hundred twenty".