2006161661 has 8 divisors (see below), whose sum is σ = 2293038720. Its totient is φ = 1719355248.

The previous prime is 2006161657. The next prime is 2006161673. The reversal of 2006161661 is 1661616002.

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

It is a cyclic number.

It is not a de Polignac number, because 2006161661 - 2² = 2006161657 is a prime.

It is a super-2 number, since 2×2006161661² = 8049369220132557842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006161061) 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, 77120 + ... + 99798.

It is an arithmetic number, because the mean of its divisors is an integer number (286629840).

Almost surely, 2^2006161661 is an apocalyptic number.

It is an amenable number.

2006161661 is a deficient number, since it is larger than the sum of its proper divisors (286877059).

2006161661 is a wasteful number, since it uses less digits than its factorization.

2006161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35323.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2006161661 is about 44790.1960366328. The cubic root of 2006161661 is about 1261.2135911681.

Adding to 2006161661 its reverse (1661616002), we get a palindrome (3667777663).

The spelling of 2006161661 in words is "two billion, six million, one hundred sixty-one thousand, six hundred sixty-one".