1666820683 has 8 divisors (see below), whose sum is σ = 1862700336. Its totient is φ = 1478332800.

The previous prime is 1666820677. The next prime is 1666820689. The reversal of 1666820683 is 3860286661.

It is an interprime number because it is at equal distance from previous prime (1666820677) and next prime (1666820689).

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 1666820683 - 2¹³ = 1666812491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666820689) 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, 1847466 + ... + 1848367.

It is an arithmetic number, because the mean of its divisors is an integer number (232837542).

Almost surely, 2^1666820683 is an apocalyptic number.

1666820683 is a deficient number, since it is larger than the sum of its proper divisors (195879653).

1666820683 is a wasteful number, since it uses less digits than its factorization.

1666820683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3695885.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 1666820683 is about 40826.7153099536. The cubic root of 1666820683 is about 1185.6676216828.

The spelling of 1666820683 in words is "one billion, six hundred sixty-six million, eight hundred twenty thousand, six hundred eighty-three".