1066556020 has 12 divisors (see below), whose sum is σ = 2239767684. Its totient is φ = 426622400.

The previous prime is 1066556003. The next prime is 1066556027. The reversal of 1066556020 is 206556601.

It can be written as a sum of positive squares in 2 ways, for example, as 609793636 + 456762384 = 24694^2 + 21372^2 .

It is a super-2 number, since 2×1066556020² = 2275083487596480800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066556027) 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 3 ways as a sum of consecutive naturals, for example, 26663881 + ... + 26663920.

It is an arithmetic number, because the mean of its divisors is an integer number (186647307).

Almost surely, 2^1066556020 is an apocalyptic number.

1066556020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066556020 is an abundant number, since it is smaller than the sum of its proper divisors (1173211664).

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

1066556020 is a wasteful number, since it uses less digits than its factorization.

1066556020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53327810 (or 53327808 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1066556020 is about 32658.1692689593. The cubic root of 1066556020 is about 1021.7105796430.

The spelling of 1066556020 in words is "one billion, sixty-six million, five hundred fifty-six thousand, twenty".