1662061220 has 24 divisors (see below), whose sum is σ = 3492720000. Its totient is φ = 664368992.

The previous prime is 1662061199. The next prime is 1662061229. The reversal of 1662061220 is 221602661.

It is a self number, because there is not a number n which added to its sum of digits gives 1662061220.

It is not an unprimeable number, because it can be changed into a prime (1662061229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261 + ... + 57699.

It is an arithmetic number, because the mean of its divisors is an integer number (145530000).

Almost surely, 2^1662061220 is an apocalyptic number.

1662061220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662061220 is an abundant number, since it is smaller than the sum of its proper divisors (1830658780).

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

1662061220 is a wasteful number, since it uses less digits than its factorization.

1662061220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56947 (or 56945 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1662061220 is about 40768.3850550889. The cubic root of 1662061220 is about 1184.5380218928.

Adding to 1662061220 its reverse (221602661), we get a palindrome (1883663881).

The spelling of 1662061220 in words is "one billion, six hundred sixty-two million, sixty-one thousand, two hundred twenty".