1666869677 has 16 divisors (see below), whose sum is σ = 1916006400. Its totient is φ = 1434158640.

The previous prime is 1666869653. The next prime is 1666869679. The reversal of 1666869677 is 7769686661.

It is a cyclic number.

It is not a de Polignac number, because 1666869677 - 2²⁴ = 1650092461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666869679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244724 + ... + 251442.

It is an arithmetic number, because the mean of its divisors is an integer number (119750400).

Almost surely, 2^1666869677 is an apocalyptic number.

It is an amenable number.

1666869677 is a deficient number, since it is larger than the sum of its proper divisors (249136723).

1666869677 is a wasteful number, since it uses less digits than its factorization.

1666869677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7936.

The product of its digits is 27433728, while the sum is 62.

The square root of 1666869677 is about 40827.3153293233. The cubic root of 1666869677 is about 1185.6792386153.

The spelling of 1666869677 in words is "one billion, six hundred sixty-six million, eight hundred sixty-nine thousand, six hundred seventy-seven".