2011616721555 has 32 divisors (see below), whose sum is σ = 3704848089600. Its totient is φ = 912980408832.

The previous prime is 2011616721509. The next prime is 2011616721571. The reversal of 2011616721555 is 5551276161102.

It is a happy number.

It is not a de Polignac number, because 2011616721555 - 2⁸ = 2011616721299 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68899990 + ... + 68929179.

It is an arithmetic number, because the mean of its divisors is an integer number (115776502800).

Almost surely, 2^{2011616721555} is an apocalyptic number.

2011616721555 is a deficient number, since it is larger than the sum of its proper divisors (1693231368045).

2011616721555 is a wasteful number, since it uses less digits than its factorization.

2011616721555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137829323.

The product of its (nonzero) digits is 126000, while the sum is 42.

The spelling of 2011616721555 in words is "two trillion, eleven billion, six hundred sixteen million, seven hundred twenty-one thousand, five hundred fifty-five".