2661281751835 has 16 divisors (see below), whose sum is σ = 3651602169600. Its totient is φ = 1823956746336.

The previous prime is 2661281751809. The next prime is 2661281751847. The reversal of 2661281751835 is 5381571821662.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2661281751835 - 2⁵ = 2661281751803 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19141605 + ... + 19280134.

It is an arithmetic number, because the mean of its divisors is an integer number (228225135600).

Almost surely, 2^{2661281751835} is an apocalyptic number.

2661281751835 is a deficient number, since it is larger than the sum of its proper divisors (990320417765).

2661281751835 is a wasteful number, since it uses less digits than its factorization.

2661281751835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38423730.

The product of its digits is 4838400, while the sum is 55.

The spelling of 2661281751835 in words is "two trillion, six hundred sixty-one billion, two hundred eighty-one million, seven hundred fifty-one thousand, eight hundred thirty-five".