1666526087 has 2 divisors, whose sum is σ = 1666526088. Its totient is φ = 1666526086.

The previous prime is 1666526033. The next prime is 1666526123. The reversal of 1666526087 is 7806256661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666526087 - 2⁶ = 1666526023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666520087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833263043 + 833263044.

It is an arithmetic number, because the mean of its divisors is an integer number (833263044).

Almost surely, 2^1666526087 is an apocalyptic number.

1666526087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666526087 is an equidigital number, since it uses as much as digits as its factorization.

1666526087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 1666526087 is about 40823.1072678208. The cubic root of 1666526087 is about 1185.5977654344.

The spelling of 1666526087 in words is "one billion, six hundred sixty-six million, five hundred twenty-six thousand, eighty-seven".