2601643661 has 8 divisors (see below), whose sum is σ = 2628578304. Its totient is φ = 2574848080.

The previous prime is 2601643657. The next prime is 2601643711. The reversal of 2601643661 is 1663461062.

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

It is not a de Polignac number, because 2601643661 - 2² = 2601643657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2601643601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3056 + ... + 72198.

It is an arithmetic number, because the mean of its divisors is an integer number (328572288).

Almost surely, 2^2601643661 is an apocalyptic number.

It is an amenable number.

2601643661 is a deficient number, since it is larger than the sum of its proper divisors (26934643).

2601643661 is a wasteful number, since it uses less digits than its factorization.

2601643661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69531.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 2601643661 is about 51006.3100116054. The cubic root of 2601643661 is about 1375.3585684799.

The spelling of 2601643661 in words is "two billion, six hundred one million, six hundred forty-three thousand, six hundred sixty-one".