2169641681 has 8 divisors (see below), whose sum is σ = 2265935424. Its totient is φ = 2073511440.

The previous prime is 2169641659. The next prime is 2169641743. The reversal of 2169641681 is 1861469612.

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 2169641681 - 2²² = 2165447377 is a prime.

It is a super-2 number, since 2×2169641681² = 9414690047865011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2169641611) 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, 13346 + ... + 67211.

It is an arithmetic number, because the mean of its divisors is an integer number (283241928).

Almost surely, 2^2169641681 is an apocalyptic number.

It is an amenable number.

2169641681 is a deficient number, since it is larger than the sum of its proper divisors (96293743).

2169641681 is a wasteful number, since it uses less digits than its factorization.

2169641681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81751.

The product of its digits is 124416, while the sum is 44.

The square root of 2169641681 is about 46579.4126304744. The cubic root of 2169641681 is about 1294.5813270689.

The spelling of 2169641681 in words is "two billion, one hundred sixty-nine million, six hundred forty-one thousand, six hundred eighty-one".