1205642166 has 16 divisors (see below), whose sum is σ = 2411640000. Its totient is φ = 401821448.

The previous prime is 1205642117. The next prime is 1205642281. The reversal of 1205642166 is 6612465021.

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, 53425 + ... + 72563.

It is an arithmetic number, because the mean of its divisors is an integer number (150727500).

Almost surely, 2^1205642166 is an apocalyptic number.

1205642166 is an abundant number, since it is smaller than the sum of its proper divisors (1205997834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1205642166 is a wasteful number, since it uses less digits than its factorization.

1205642166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29643.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1205642166 is about 34722.3583012445. The cubic root of 1205642166 is about 1064.3214368640.

The spelling of 1205642166 in words is "one billion, two hundred five million, six hundred forty-two thousand, one hundred sixty-six".