1666750033 has 4 divisors (see below), whose sum is σ = 1794961588. Its totient is φ = 1538538480.

The previous prime is 1666750009. The next prime is 1666750103. The reversal of 1666750033 is 3300576661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 329531409 + 1337218624 = 18153^2 + 36568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666750033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666749974 and 1666750001.

It is not an unprimeable number, because it can be changed into a prime (1666750003) 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, 64105758 + ... + 64105783.

It is an arithmetic number, because the mean of its divisors is an integer number (448740397).

Almost surely, 2^1666750033 is an apocalyptic number.

1666750033 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1666750033 is a deficient number, since it is larger than the sum of its proper divisors (128211555).

1666750033 is a wasteful number, since it uses less digits than its factorization.

1666750033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128211554.

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 1666750033 is about 40825.8500585107. The cubic root of 1666750033 is about 1185.6508695106.

The spelling of 1666750033 in words is "one billion, six hundred sixty-six million, seven hundred fifty thousand, thirty-three".