71661441 has 8 divisors (see below), whose sum is σ = 95588640. Its totient is φ = 47754272.

The previous prime is 71661439. The next prime is 71661487. The reversal of 71661441 is 14416617.

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

It is a cyclic number.

It is not a de Polignac number, because 71661441 - 2¹ = 71661439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71661399 and 71661408.

It is not an unprimeable number, because it can be changed into a prime (71661241) 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, 8725 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (11948580).

Almost surely, 2^71661441 is an apocalyptic number.

It is an amenable number.

71661441 is a deficient number, since it is larger than the sum of its proper divisors (23927199).

71661441 is a wasteful number, since it uses less digits than its factorization.

71661441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10015.

The product of its digits is 4032, while the sum is 30.

The square root of 71661441 is about 8465.3080865377. The cubic root of 71661441 is about 415.3636740498.

The spelling of 71661441 in words is "seventy-one million, six hundred sixty-one thousand, four hundred forty-one".