1668555018355 has 16 divisors (see below), whose sum is σ = 2044421346240. Its totient is φ = 1307031694848.

The previous prime is 1668555018343. The next prime is 1668555018419. The reversal of 1668555018355 is 5538105558661.

It is a cyclic number.

It is not a de Polignac number, because 1668555018355 - 2⁷ = 1668555018227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1668555018355.

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, 18155922 + ... + 18247591.

It is an arithmetic number, because the mean of its divisors is an integer number (127776334140).

Almost surely, 2^{1668555018355} is an apocalyptic number.

1668555018355 is a deficient number, since it is larger than the sum of its proper divisors (375866327885).

1668555018355 is a wasteful number, since it uses less digits than its factorization.

1668555018355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36403710.

The product of its (nonzero) digits is 21600000, while the sum is 58.

The spelling of 1668555018355 in words is "one trillion, six hundred sixty-eight billion, five hundred fifty-five million, eighteen thousand, three hundred fifty-five".