1666604534 has 8 divisors (see below), whose sum is σ = 2857036368. Its totient is φ = 714259080.

The previous prime is 1666604519. The next prime is 1666604543. The reversal of 1666604534 is 4354066661.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1666604491 and 1666604500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59521577 + ... + 59521604.

It is an arithmetic number, because the mean of its divisors is an integer number (357129546).

Almost surely, 2^1666604534 is an apocalyptic number.

1666604534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1666604534 is a deficient number, since it is larger than the sum of its proper divisors (1190431834).

1666604534 is a wasteful number, since it uses less digits than its factorization.

1666604534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119043190.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 1666604534 is about 40824.0680726456. The cubic root of 1666604534 is about 1185.6163680292.

The spelling of 1666604534 in words is "one billion, six hundred sixty-six million, six hundred four thousand, five hundred thirty-four".