165561603403606 has 16 divisors (see below), whose sum is σ = 250837954567200. Its totient is φ = 81949493279808.

The previous prime is 165561603403583. The next prime is 165561603403619. The reversal of 165561603403606 is 606304306165561.

165561603403606 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134736501 + ... + 135959728.

It is an arithmetic number, because the mean of its divisors is an integer number (15677372160450).

Almost surely, 2^{165561603403606} is an apocalyptic number.

165561603403606 is a deficient number, since it is larger than the sum of its proper divisors (85276351163594).

165561603403606 is a wasteful number, since it uses less digits than its factorization.

165561603403606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270699303.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The spelling of 165561603403606 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, six hundred three million, four hundred three thousand, six hundred six".