1600006661 has 8 divisors (see below), whose sum is σ = 1821351744. Its totient is φ = 1391309920.

The previous prime is 1600006657. The next prime is 1600006669. The reversal of 1600006661 is 1666000061.

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

It is not a de Polignac number, because 1600006661 - 2² = 1600006657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1600006661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1600006669) 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, 3161816 + ... + 3162321.

It is an arithmetic number, because the mean of its divisors is an integer number (227668968).

Almost surely, 2^1600006661 is an apocalyptic number.

1600006661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1600006661 is a deficient number, since it is larger than the sum of its proper divisors (221345083).

1600006661 is a wasteful number, since it uses less digits than its factorization.

1600006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324171.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1600006661 is about 40000.0832624133. The cubic root of 1600006661 is about 1169.6087183564.

It can be divided in two parts, 160000 and 6661, that added together give a palindrome (166661).

The spelling of 1600006661 in words is "one billion, six hundred million, six thousand, six hundred sixty-one".