1668521022 has 64 divisors (see below), whose sum is σ = 3850222080. Its totient is φ = 472189824.

The previous prime is 1668520969. The next prime is 1668521027. The reversal of 1668521022 is 2201258661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668521027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2721588 + ... + 2722200.

It is an arithmetic number, because the mean of its divisors is an integer number (60159720).

Almost surely, 2^1668521022 is an apocalyptic number.

1668521022 is an abundant number, since it is smaller than the sum of its proper divisors (2181701058).

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

1668521022 is a wasteful number, since it uses less digits than its factorization.

1668521022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1668521022 is about 40847.5338545670. The cubic root of 1668521022 is about 1186.0706547907.

Adding to 1668521022 its reverse (2201258661), we get a palindrome (3869779683).

The spelling of 1668521022 in words is "one billion, six hundred sixty-eight million, five hundred twenty-one thousand, twenty-two".