11661505016506 has 8 divisors (see below), whose sum is σ = 17492289874164. Its totient is φ = 5830741725120.

The previous prime is 11661505016503. The next prime is 11661505016573. The reversal of 11661505016506 is 60561050516611.

It can be written as a sum of positive squares in 2 ways, for example, as 11081075880625 + 580429135881 = 3328825^2 + 761859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (11661505016503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3964165 + ... + 6248008.

Almost surely, 2^{11661505016506} is an apocalyptic number.

11661505016506 is a deficient number, since it is larger than the sum of its proper divisors (5830784857658).

11661505016506 is a wasteful number, since it uses less digits than its factorization.

11661505016506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10783136.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 11661505016506 in words is "eleven trillion, six hundred sixty-one billion, five hundred five million, sixteen thousand, five hundred six".