1660206123505 has 16 divisors (see below), whose sum is σ = 2078915485824. Its totient is φ = 1270388845440.

The previous prime is 1660206123481. The next prime is 1660206123553. The reversal of 1660206123505 is 5053216020661.

It is not a de Polignac number, because 1660206123505 - 2¹⁵ = 1660206090737 is a prime.

It is a Duffinian 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, 5621077 + ... + 5909053.

It is an arithmetic number, because the mean of its divisors is an integer number (129932217864).

Almost surely, 2^{1660206123505} is an apocalyptic number.

It is an amenable number.

1660206123505 is a deficient number, since it is larger than the sum of its proper divisors (418709362319).

1660206123505 is a wasteful number, since it uses less digits than its factorization.

1660206123505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338136.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 1660206123505 in words is "one trillion, six hundred sixty billion, two hundred six million, one hundred twenty-three thousand, five hundred five".