1066601220 has 48 divisors (see below), whose sum is σ = 3067205568. Its totient is φ = 276739200.

The previous prime is 1066601219. The next prime is 1066601227. The reversal of 1066601220 is 221066601.

It is a super-2 number, since 2×1066601220² = 2275276325010976800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066601227) 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, 238006 + ... + 242445.

It is an arithmetic number, because the mean of its divisors is an integer number (63900116).

Almost surely, 2^1066601220 is an apocalyptic number.

1066601220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066601220 is an abundant number, since it is smaller than the sum of its proper divisors (2000604348).

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

1066601220 is a wasteful number, since it uses less digits than its factorization.

1066601220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480500 (or 480498 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1066601220 is about 32658.8612783728. The cubic root of 1066601220 is about 1021.7250125982.

Adding to 1066601220 its reverse (221066601), we get a palindrome (1287667821).

It can be divided in two parts, 106660 and 1220, that added together give a triangular number (107880 = T₄₆₄).

The spelling of 1066601220 in words is "one billion, sixty-six million, six hundred one thousand, two hundred twenty".