201517660206078 has 32 divisors (see below), whose sum is σ = 407879994592800. Its totient is φ = 66366278770176.

The previous prime is 201517660206001. The next prime is 201517660206311. The reversal of 201517660206078 is 870602066715102.

It is a self number, because there is not a number n which added to its sum of digits gives 201517660206078.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145694101 + ... + 147070752.

It is an arithmetic number, because the mean of its divisors is an integer number (12746249831025).

Almost surely, 2^{201517660206078} is an apocalyptic number.

201517660206078 is an abundant number, since it is smaller than the sum of its proper divisors (206362334386722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201517660206078 is a wasteful number, since it uses less digits than its factorization.

201517660206078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292766236.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 201517660206078 in words is "two hundred one trillion, five hundred seventeen billion, six hundred sixty million, two hundred six thousand, seventy-eight".