1666833537 has 8 divisors (see below), whose sum is σ = 2227750560. Its totient is φ = 1108569440.

The previous prime is 1666833523. The next prime is 1666833541. The reversal of 1666833537 is 7353386661.

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 1666833537 - 2¹⁵ = 1666800769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666833587) 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, 661764 + ... + 664277.

It is an arithmetic number, because the mean of its divisors is an integer number (278468820).

Almost surely, 2^1666833537 is an apocalyptic number.

It is an amenable number.

1666833537 is a deficient number, since it is larger than the sum of its proper divisors (560917023).

1666833537 is a wasteful number, since it uses less digits than its factorization.

1666833537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326463.

The product of its digits is 1632960, while the sum is 48.

The square root of 1666833537 is about 40826.8727310824. The cubic root of 1666833537 is about 1185.6706695076.

It can be divided in two parts, 16668 and 33537, that added together give a palindrome (50205).

The spelling of 1666833537 in words is "one billion, six hundred sixty-six million, eight hundred thirty-three thousand, five hundred thirty-seven".