1666545053 has 8 divisors (see below), whose sum is σ = 1688419200. Its totient is φ = 1644690528.

The previous prime is 1666544989. The next prime is 1666545079. The reversal of 1666545053 is 3505456661.

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 1666545053 - 2⁶ = 1666544989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666545053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666545553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254225 + ... + 260697.

It is an arithmetic number, because the mean of its divisors is an integer number (211052400).

Almost surely, 2^1666545053 is an apocalyptic number.

It is an amenable number.

1666545053 is a deficient number, since it is larger than the sum of its proper divisors (21874147).

1666545053 is an equidigital number, since it uses as much as digits as its factorization.

1666545053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9811.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 1666545053 is about 40823.3395620691. The cubic root of 1666545053 is about 1185.6022630061.

The spelling of 1666545053 in words is "one billion, six hundred sixty-six million, five hundred forty-five thousand, fifty-three".