1666677499 has 4 divisors (see below), whose sum is σ = 1679400360. Its totient is φ = 1653954640.

The previous prime is 1666677487. The next prime is 1666677517. The reversal of 1666677499 is 9947766661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9947766661 = 7 ⋅1421109523.

It is a cyclic number.

It is not a de Polignac number, because 1666677499 - 2²⁵ = 1633123067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666677409) 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, 6361234 + ... + 6361495.

It is an arithmetic number, because the mean of its divisors is an integer number (419850090).

Almost surely, 2^1666677499 is an apocalyptic number.

1666677499 is a deficient number, since it is larger than the sum of its proper divisors (12722861).

1666677499 is a wasteful number, since it uses less digits than its factorization.

1666677499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12722860.

The product of its digits is 20575296, while the sum is 61.

The square root of 1666677499 is about 40824.9617146177. The cubic root of 1666677499 is about 1185.6336701214.

The spelling of 1666677499 in words is "one billion, six hundred sixty-six million, six hundred seventy-seven thousand, four hundred ninety-nine".