1066645520 has 80 divisors (see below), whose sum is σ = 2648401920. Its totient is φ = 398630400.

The previous prime is 1066645519. The next prime is 1066645523. The reversal of 1066645520 is 255466601.

1066645520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1066645520² = 2275465330672140800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066645523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64505 + ... + 79335.

It is an arithmetic number, because the mean of its divisors is an integer number (33105024).

Almost surely, 2^1066645520 is an apocalyptic number.

1066645520 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 1066645520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324200960).

1066645520 is an abundant number, since it is smaller than the sum of its proper divisors (1581756400).

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

1066645520 is a wasteful number, since it uses less digits than its factorization.

1066645520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904 (or 14898 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1066645520 is about 32659.5394946101. The cubic root of 1066645520 is about 1021.7391577759.

The spelling of 1066645520 in words is "one billion, sixty-six million, six hundred forty-five thousand, five hundred twenty".