2649540661 has 8 divisors (see below), whose sum is σ = 2847268800. Its totient is φ = 2456465088.

The previous prime is 2649540653. The next prime is 2649540679. The reversal of 2649540661 is 1660459462.

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 2649540661 - 2³ = 2649540653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649547661) 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, 1161961 + ... + 1164238.

It is an arithmetic number, because the mean of its divisors is an integer number (355908600).

Almost surely, 2^2649540661 is an apocalyptic number.

It is an amenable number.

2649540661 is a deficient number, since it is larger than the sum of its proper divisors (197728139).

2649540661 is a wasteful number, since it uses less digits than its factorization.

2649540661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326283.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 2649540661 is about 51473.6890168171. The cubic root of 2649540661 is about 1383.7475435599.

The spelling of 2649540661 in words is "two billion, six hundred forty-nine million, five hundred forty thousand, six hundred sixty-one".