1666847087 has 8 divisors (see below), whose sum is σ = 1708039872. Its totient is φ = 1625680000.

The previous prime is 1666847081. The next prime is 1666847101. The reversal of 1666847087 is 7807486661.

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 1666847087 - 2⁴ = 1666847071 is a prime.

It is a super-2 number, since 2×1666847087² = 5556758422880771138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666847081) 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, 234587 + ... + 241587.

It is an arithmetic number, because the mean of its divisors is an integer number (213504984).

Almost surely, 2^1666847087 is an apocalyptic number.

1666847087 is a deficient number, since it is larger than the sum of its proper divisors (41192785).

1666847087 is an equidigital number, since it uses as much as digits as its factorization.

1666847087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12849.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The square root of 1666847087 is about 40827.0386753681. The cubic root of 1666847087 is about 1185.6738823447.

The spelling of 1666847087 in words is "one billion, six hundred sixty-six million, eight hundred forty-seven thousand, eighty-seven".