1666365828 has 24 divisors (see below), whose sum is σ = 3889002432. Its totient is φ = 555338784.

The previous prime is 1666365809. The next prime is 1666365889. The reversal of 1666365828 is 8285636661.

It is a super-2 number, since 2×1666365828² = 5553550145452251168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60526 + ... + 83642.

It is an arithmetic number, because the mean of its divisors is an integer number (162041768).

Almost surely, 2^1666365828 is an apocalyptic number.

It is an amenable number.

1666365828 is an abundant number, since it is smaller than the sum of its proper divisors (2222636604).

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

1666365828 is a wasteful number, since it uses less digits than its factorization.

1666365828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29131 (or 29129 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The square root of 1666365828 is about 40821.1443739638. The cubic root of 1666365828 is about 1185.5597604681.

The spelling of 1666365828 in words is "one billion, six hundred sixty-six million, three hundred sixty-five thousand, eight hundred twenty-eight".