15666055506050 has 12 divisors (see below), whose sum is σ = 29138863241346. Its totient is φ = 6266422202400.

The previous prime is 15666055506043. The next prime is 15666055506067. The reversal of 15666055506050 is 5060555066651.

It can be written as a sum of positive squares in 3 ways, for example, as 12181363412761 + 3484692093289 = 3490181^2 + 1866733^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 313321110121 = 15666055506050 / (1 + 5 + 6 + 6 + 6 + 0 + 5 + 5 + 5 + 0 + 6 + 0 + 5 + 0).

It is a self number, because there is not a number n which added to its sum of digits gives 15666055506050.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156660555011 + ... + 156660555110.

Almost surely, 2^{15666055506050} is an apocalyptic number.

15666055506050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15666055506050 is a deficient number, since it is larger than the sum of its proper divisors (13472807735296).

15666055506050 is a wasteful number, since it uses less digits than its factorization.

15666055506050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313321110133 (or 313321110128 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 50.

The spelling of 15666055506050 in words is "fifteen trillion, six hundred sixty-six billion, fifty-five million, five hundred six thousand, fifty".