2661642013 has 8 divisors (see below), whose sum is σ = 2688445728. Its totient is φ = 2634874224.

The previous prime is 2661641971. The next prime is 2661642017. The reversal of 2661642013 is 3102461662.

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 2661642013 - 2⁹ = 2661641501 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 (2661642017) 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, 154795 + ... + 171127.

It is an arithmetic number, because the mean of its divisors is an integer number (336055716).

Almost surely, 2^2661642013 is an apocalyptic number.

It is an amenable number.

2661642013 is a deficient number, since it is larger than the sum of its proper divisors (26803715).

2661642013 is a wasteful number, since it uses less digits than its factorization.

2661642013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17963.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 2661642013 is about 51591.1040102846. The cubic root of 2661642013 is about 1385.8510260170.

The spelling of 2661642013 in words is "two billion, six hundred sixty-one million, six hundred forty-two thousand, thirteen".