166211315510205 has 32 divisors (see below), whose sum is σ = 303930698655744. Its totient is φ = 75981956659776.

The previous prime is 166211315510173. The next prime is 166211315510213. The reversal of 166211315510205 is 502015513112661.

It is not a de Polignac number, because 166211315510205 - 2⁵ = 166211315510173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19259712 + ... + 26520918.

It is an arithmetic number, because the mean of its divisors is an integer number (9497834332992).

Almost surely, 2^{166211315510205} is an apocalyptic number.

166211315510205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166211315510205 is a deficient number, since it is larger than the sum of its proper divisors (137719383145539).

166211315510205 is a wasteful number, since it uses less digits than its factorization.

166211315510205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7479225.

The product of its (nonzero) digits is 54000, while the sum is 39.

Adding to 166211315510205 its reverse (502015513112661), we get a palindrome (668226828622866).

The spelling of 166211315510205 in words is "one hundred sixty-six trillion, two hundred eleven billion, three hundred fifteen million, five hundred ten thousand, two hundred five".