1666734487 has 8 divisors (see below), whose sum is σ = 1880954640. Its totient is φ = 1462964160.

The previous prime is 1666734479. The next prime is 1666734521. The reversal of 1666734487 is 7844376661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666734487 - 2³ = 1666734479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666734427) 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, 2612118 + ... + 2612755.

It is an arithmetic number, because the mean of its divisors is an integer number (235119330).

Almost surely, 2^1666734487 is an apocalyptic number.

1666734487 is a deficient number, since it is larger than the sum of its proper divisors (214220153).

1666734487 is a wasteful number, since it uses less digits than its factorization.

1666734487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5224913.

The product of its digits is 4064256, while the sum is 52.

The square root of 1666734487 is about 40825.6596639907. The cubic root of 1666734487 is about 1185.6471832579.

The spelling of 1666734487 in words is "one billion, six hundred sixty-six million, seven hundred thirty-four thousand, four hundred eighty-seven".