16666487 has 2 divisors, whose sum is σ = 16666488. Its totient is φ = 16666486.

The previous prime is 16666453. The next prime is 16666493. The reversal of 16666487 is 78466661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16666487 - 2⁶ = 16666423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16666417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333243 + 8333244.

It is an arithmetic number, because the mean of its divisors is an integer number (8333244).

Almost surely, 2^16666487 is an apocalyptic number.

16666487 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666487 is an equidigital number, since it uses as much as digits as its factorization.

16666487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 16666487 is about 4082.4608999965. The cubic root of 16666487 is about 255.4355595928.

The spelling of 16666487 in words is "sixteen million, six hundred sixty-six thousand, four hundred eighty-seven".