1666067568 has 80 divisors (see below), whose sum is σ = 4700592000. Its totient is φ = 504298240.

The previous prime is 1666067509. The next prime is 1666067569. The reversal of 1666067568 is 8657606661.

It is a happy number.

It is a super-2 number, since 2×1666067568² = 5551562282282869248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1666067568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666067569) 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, 853858 + ... + 855806.

It is an arithmetic number, because the mean of its divisors is an integer number (58757400).

Almost surely, 2^1666067568 is an apocalyptic number.

It is an amenable number.

1666067568 is an abundant number, since it is smaller than the sum of its proper divisors (3034524432).

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

1666067568 is a wasteful number, since it uses less digits than its factorization.

1666067568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590 (or 3584 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The square root of 1666067568 is about 40817.4909566965. The cubic root of 1666067568 is about 1185.4890224690.

The spelling of 1666067568 in words is "one billion, six hundred sixty-six million, sixty-seven thousand, five hundred sixty-eight".