11661555155005 has 16 divisors (see below), whose sum is σ = 16231691272320. Its totient is φ = 7877144290752.

The previous prime is 11661555154981. The next prime is 11661555155051. The reversal of 11661555155005 is 50055155516611.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11661555155005 - 2⁵ = 11661555154973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486469970 + ... + 2486474659.

It is an arithmetic number, because the mean of its divisors is an integer number (1014480704520).

Almost surely, 2^{11661555155005} is an apocalyptic number.

It is an amenable number.

11661555155005 is a deficient number, since it is larger than the sum of its proper divisors (4570136117315).

11661555155005 is an equidigital number, since it uses as much as digits as its factorization.

11661555155005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4972944708.

The product of its (nonzero) digits is 562500, while the sum is 46.

The spelling of 11661555155005 in words is "eleven trillion, six hundred sixty-one billion, five hundred fifty-five million, one hundred fifty-five thousand, five".