1666965433 has 4 divisors (see below), whose sum is σ = 1905103360. Its totient is φ = 1428827508.

The previous prime is 1666965431. The next prime is 1666965451. The reversal of 1666965433 is 3345696661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3345696661 = 54721 ⋅61141.

It is a cyclic number.

It is not a de Polignac number, because 1666965433 - 2¹ = 1666965431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666965431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119068953 + ... + 119068966.

It is an arithmetic number, because the mean of its divisors is an integer number (476275840).

Almost surely, 2^1666965433 is an apocalyptic number.

It is an amenable number.

1666965433 is a deficient number, since it is larger than the sum of its proper divisors (238137927).

1666965433 is an equidigital number, since it uses as much as digits as its factorization.

1666965433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238137926.

The product of its digits is 2099520, while the sum is 49.

The square root of 1666965433 is about 40828.4880077624. The cubic root of 1666965433 is about 1185.7019425952.

The spelling of 1666965433 in words is "one billion, six hundred sixty-six million, nine hundred sixty-five thousand, four hundred thirty-three".