1666828959 has 8 divisors (see below), whose sum is σ = 2264371632. Its totient is φ = 1090252800.

The previous prime is 1666828931. The next prime is 1666828973. The reversal of 1666828959 is 9598286661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666828959 - 2⁵ = 1666828927 is a prime.

It is a super-2 number, since 2×1666828959² = 5556637557122047362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666828259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5241442 + ... + 5241759.

It is an arithmetic number, because the mean of its divisors is an integer number (283046454).

Almost surely, 2^1666828959 is an apocalyptic number.

1666828959 is a deficient number, since it is larger than the sum of its proper divisors (597542673).

1666828959 is a wasteful number, since it uses less digits than its factorization.

1666828959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10483257.

The product of its digits is 11197440, while the sum is 60.

The square root of 1666828959 is about 40826.8166650304. The cubic root of 1666828959 is about 1185.6695840152.

The spelling of 1666828959 in words is "one billion, six hundred sixty-six million, eight hundred twenty-eight thousand, nine hundred fifty-nine".