2660667517 has 4 divisors (see below), whose sum is σ = 2661810300. Its totient is φ = 2659524736.

The previous prime is 2660667497. The next prime is 2660667557. The reversal of 2660667517 is 7157660662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1320668281 + 1339999236 = 36341^2 + 36606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2660667517 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 (2660667557) 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 3 ways as a sum of consecutive naturals, for example, 567892 + ... + 572557.

It is an arithmetic number, because the mean of its divisors is an integer number (665452575).

Almost surely, 2^2660667517 is an apocalyptic number.

It is an amenable number.

2660667517 is a deficient number, since it is larger than the sum of its proper divisors (1142783).

2660667517 is a wasteful number, since it uses less digits than its factorization.

2660667517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142782.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 2660667517 is about 51581.6587267218. The cubic root of 2660667517 is about 1385.6818734004.

The spelling of 2660667517 in words is "two billion, six hundred sixty million, six hundred sixty-seven thousand, five hundred seventeen".