166361639 has 2 divisors, whose sum is σ = 166361640. Its totient is φ = 166361638.

The previous prime is 166361633. The next prime is 166361687. The reversal of 166361639 is 936163661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166361639 - 2²⁴ = 149584423 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166361596 and 166361605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166361633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83180819 + 83180820.

It is an arithmetic number, because the mean of its divisors is an integer number (83180820).

Almost surely, 2^166361639 is an apocalyptic number.

166361639 is a deficient number, since it is larger than the sum of its proper divisors (1).

166361639 is an equidigital number, since it uses as much as digits as its factorization.

166361639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 166361639 is about 12898.1254064302. The cubic root of 166361639 is about 549.9852767409.

The spelling of 166361639 in words is "one hundred sixty-six million, three hundred sixty-one thousand, six hundred thirty-nine".