4008161661 has 16 divisors (see below), whose sum is σ = 6139327104. Its totient is φ = 2278508544.

The previous prime is 4008161653. The next prime is 4008161693. The reversal of 4008161661 is 1661618004.

It is not a de Polignac number, because 4008161661 - 2³ = 4008161653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4008161161) 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, 490416 + ... + 498521.

It is an arithmetic number, because the mean of its divisors is an integer number (383707944).

Almost surely, 2^4008161661 is an apocalyptic number.

It is an amenable number.

4008161661 is a deficient number, since it is larger than the sum of its proper divisors (2131165443).

4008161661 is a wasteful number, since it uses less digits than its factorization.

4008161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989140.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 4008161661 is about 63310.0439187970. The cubic root of 4008161661 is about 1588.4799709245.

Adding to 4008161661 its reverse (1661618004), we get a palindrome (5669779665).

The spelling of 4008161661 in words is "four billion, eight million, one hundred sixty-one thousand, six hundred sixty-one".