166166587 has 2 divisors, whose sum is σ = 166166588. Its totient is φ = 166166586.

The previous prime is 166166543. The next prime is 166166599. The reversal of 166166587 is 785661661.

166166587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (785661661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166166587 - 2¹⁹ = 165642299 is a prime.

It is a super-2 number, since 2×166166587² = 55222669270457138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166166887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83083293 + 83083294.

It is an arithmetic number, because the mean of its divisors is an integer number (83083294).

Almost surely, 2^166166587 is an apocalyptic number.

166166587 is a deficient number, since it is larger than the sum of its proper divisors (1).

166166587 is an equidigital number, since it uses as much as digits as its factorization.

166166587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 166166587 is about 12890.5619349972. The cubic root of 166166587 is about 549.7702478404.

It can be divided in two parts, 166166 and 587, that added together give a triangular number (166753 = T₅₇₇).

The spelling of 166166587 in words is "one hundred sixty-six million, one hundred sixty-six thousand, five hundred eighty-seven".