1666541220453 has 24 divisors (see below), whose sum is σ = 2454734077536. Its totient is φ = 1089257954400.

The previous prime is 1666541220431. The next prime is 1666541220457. The reversal of 1666541220453 is 3540221456661.

It is not a de Polignac number, because 1666541220453 - 2¹³ = 1666541212261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666541220399 and 1666541220408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666541220457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6421938 + ... + 6676403.

It is an arithmetic number, because the mean of its divisors is an integer number (102280586564).

Almost surely, 2^{1666541220453} is an apocalyptic number.

It is an amenable number.

1666541220453 is a deficient number, since it is larger than the sum of its proper divisors (788192857083).

1666541220453 is a wasteful number, since it uses less digits than its factorization.

1666541220453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13098625 (or 13098622 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 1666541220453 in words is "one trillion, six hundred sixty-six billion, five hundred forty-one million, two hundred twenty thousand, four hundred fifty-three".