71661039 has 8 divisors (see below), whose sum is σ = 96082560. Its totient is φ = 47506776.

The previous prime is 71661019. The next prime is 71661047. The reversal of 71661039 is 93016617.

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

It is not a de Polignac number, because 71661039 - 2⁸ = 71660783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71661019) 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, 66187 + ... + 67260.

It is an arithmetic number, because the mean of its divisors is an integer number (12010320).

Almost surely, 2^71661039 is an apocalyptic number.

71661039 is a deficient number, since it is larger than the sum of its proper divisors (24421521).

71661039 is a wasteful number, since it uses less digits than its factorization.

71661039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133629.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 71661039 is about 8465.2843425369. The cubic root of 71661039 is about 415.3628973582.

The spelling of 71661039 in words is "seventy-one million, six hundred sixty-one thousand, thirty-nine".