71660205 has 24 divisors (see below), whose sum is σ = 125499192. Its totient is φ = 37822464.

The previous prime is 71660137. The next prime is 71660227. The reversal of 71660205 is 50206617.

It can be written as a sum of positive squares in 4 ways, for example, as 1954404 + 69705801 = 1398^2 + 8349^2 .

It is not a de Polignac number, because 71660205 - 2⁸ = 71659949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3844 + ... + 12573.

It is an arithmetic number, because the mean of its divisors is an integer number (5229133).

Almost surely, 2^71660205 is an apocalyptic number.

It is an amenable number.

71660205 is a deficient number, since it is larger than the sum of its proper divisors (53838987).

71660205 is a wasteful number, since it uses less digits than its factorization.

71660205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16525 (or 16522 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 71660205 is about 8465.2350823825. The cubic root of 71660205 is about 415.3612860038.

The spelling of 71660205 in words is "seventy-one million, six hundred sixty thousand, two hundred five".