2645649661 has 8 divisors (see below), whose sum is σ = 2785376000. Its totient is φ = 2505971520.

The previous prime is 2645649659. The next prime is 2645649697. The reversal of 2645649661 is 1669465462.

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 2645649661 - 2¹ = 2645649659 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 (2645643661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176116 + ... + 190546.

It is an arithmetic number, because the mean of its divisors is an integer number (348172000).

Almost surely, 2^2645649661 is an apocalyptic number.

It is an amenable number.

2645649661 is a deficient number, since it is larger than the sum of its proper divisors (139726339).

2645649661 is a wasteful number, since it uses less digits than its factorization.

2645649661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24099.

The product of its digits is 1866240, while the sum is 49.

The square root of 2645649661 is about 51435.8791214848. The cubic root of 2645649661 is about 1383.0698412482.

The spelling of 2645649661 in words is "two billion, six hundred forty-five million, six hundred forty-nine thousand, six hundred sixty-one".