1668772220 has 12 divisors (see below), whose sum is σ = 3504421704. Its totient is φ = 667508880.

The previous prime is 1668772213. The next prime is 1668772229. The reversal of 1668772220 is 222778661.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668772229) by changing a digit.

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, 41719286 + ... + 41719325.

It is an arithmetic number, because the mean of its divisors is an integer number (292035142).

Almost surely, 2^1668772220 is an apocalyptic number.

1668772220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668772220 is an abundant number, since it is smaller than the sum of its proper divisors (1835649484).

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

1668772220 is a wasteful number, since it uses less digits than its factorization.

1668772220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83438620 (or 83438618 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 1668772220 is about 40850.6085633984. The cubic root of 1668772220 is about 1186.1301732948.

The spelling of 1668772220 in words is "one billion, six hundred sixty-eight million, seven hundred seventy-two thousand, two hundred twenty".