1666538753 has 8 divisors (see below), whose sum is σ = 1819183296. Its totient is φ = 1514084400.

The previous prime is 1666538729. The next prime is 1666538759. The reversal of 1666538753 is 3578356661.

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 1666538753 - 2⁶ = 1666538689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666538759) 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, 28901 + ... + 64562.

It is an arithmetic number, because the mean of its divisors is an integer number (227397912).

Almost surely, 2^1666538753 is an apocalyptic number.

It is an amenable number.

1666538753 is a deficient number, since it is larger than the sum of its proper divisors (152644543).

1666538753 is a wasteful number, since it uses less digits than its factorization.

1666538753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95095.

The product of its digits is 2721600, while the sum is 50.

The square root of 1666538753 is about 40823.2624002541. The cubic root of 1666538753 is about 1185.6007690364.

The spelling of 1666538753 in words is "one billion, six hundred sixty-six million, five hundred thirty-eight thousand, seven hundred fifty-three".