1666940733 has 6 divisors (see below), whose sum is σ = 2407803294. Its totient is φ = 1111293816.

The previous prime is 1666940713. The next prime is 1666940741. The reversal of 1666940733 is 3370496661.

It can be written as a sum of positive squares in only one way, i.e., 1123724484 + 543216249 = 33522^2 + 23307^2 .

It is not a de Polignac number, because 1666940733 - 2⁶ = 1666940669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666940713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92607810 + ... + 92607827.

It is an arithmetic number, because the mean of its divisors is an integer number (401300549).

Almost surely, 2^1666940733 is an apocalyptic number.

It is an amenable number.

1666940733 is a deficient number, since it is larger than the sum of its proper divisors (740862561).

1666940733 is a wasteful number, since it uses less digits than its factorization.

1666940733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185215643 (or 185215640 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 1666940733 is about 40828.1855217691. The cubic root of 1666940733 is about 1185.6960862485.

The spelling of 1666940733 in words is "one billion, six hundred sixty-six million, nine hundred forty thousand, seven hundred thirty-three".