71666705 has 8 divisors (see below), whose sum is σ = 93818304. Its totient is φ = 52121200.

The previous prime is 71666701. The next prime is 71666717. The reversal of 71666705 is 50766617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71666705 - 2² = 71666701 is a prime.

It is a super-2 number, since 2×71666705² = 10272233211114050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71666701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 651461 + ... + 651570.

It is an arithmetic number, because the mean of its divisors is an integer number (11727288).

Almost surely, 2^71666705 is an apocalyptic number.

It is an amenable number.

71666705 is a deficient number, since it is larger than the sum of its proper divisors (22151599).

71666705 is a wasteful number, since it uses less digits than its factorization.

71666705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303047.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 71666705 is about 8465.6189968602. The cubic root of 71666705 is about 415.3738441906.

The spelling of 71666705 in words is "seventy-one million, six hundred sixty-six thousand, seven hundred five".