1666887454 has 16 divisors (see below), whose sum is σ = 2519330688. Its totient is φ = 827126872.

The previous prime is 1666887449. The next prime is 1666887517. The reversal of 1666887454 is 4547886661.

It is a junction number, because it is equal to n+sod(n) for n = 1666887395 and 1666887404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224469 + ... + 231775.

It is an arithmetic number, because the mean of its divisors is an integer number (157458168).

Almost surely, 2^1666887454 is an apocalyptic number.

1666887454 is a deficient number, since it is larger than the sum of its proper divisors (852443234).

1666887454 is a wasteful number, since it uses less digits than its factorization.

1666887454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159.

The product of its digits is 7741440, while the sum is 55.

The square root of 1666887454 is about 40827.5330383799. The cubic root of 1666887454 is about 1185.6834536509.

The spelling of 1666887454 in words is "one billion, six hundred sixty-six million, eight hundred eighty-seven thousand, four hundred fifty-four".