11661505050550 has 24 divisors (see below), whose sum is σ = 21951729515016. Its totient is φ = 4608401994240.

The previous prime is 11661505050527. The next prime is 11661505050563. The reversal of 11661505050550 is 5505050516611.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1404996459 + ... + 1405004758.

It is an arithmetic number, because the mean of its divisors is an integer number (914655396459).

Almost surely, 2^{11661505050550} is an apocalyptic number.

11661505050550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11661505050550 is a deficient number, since it is larger than the sum of its proper divisors (10290224464466).

11661505050550 is a wasteful number, since it uses less digits than its factorization.

11661505050550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810001312 (or 2810001307 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 11661505050550 in words is "eleven trillion, six hundred sixty-one billion, five hundred five million, fifty thousand, five hundred fifty".