1666225363555 has 8 divisors (see below), whose sum is σ = 2000672773632. Its totient is φ = 1332178732608.

The previous prime is 1666225363519. The next prime is 1666225363597. The reversal of 1666225363555 is 5553635226661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666225363555 - 2⁷ = 1666225363427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666225363496 and 1666225363505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100185634 + ... + 100202263.

It is an arithmetic number, because the mean of its divisors is an integer number (250084096704).

Almost surely, 2^{1666225363555} is an apocalyptic number.

1666225363555 is a deficient number, since it is larger than the sum of its proper divisors (334447410077).

1666225363555 is a wasteful number, since it uses less digits than its factorization.

1666225363555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200389565.

The product of its digits is 29160000, while the sum is 55.

The spelling of 1666225363555 in words is "one trillion, six hundred sixty-six billion, two hundred twenty-five million, three hundred sixty-three thousand, five hundred fifty-five".