71604268521 has 8 divisors (see below), whose sum is σ = 97692645600. Its totient is φ = 46626035232.

The previous prime is 71604268507. The next prime is 71604268531. The reversal of 71604268521 is 12586240617.

It is a happy number.

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

It is not a de Polignac number, because 71604268521 - 2²¹ = 71602171369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71604268531) 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, 277535796 + ... + 277536053.

It is an arithmetic number, because the mean of its divisors is an integer number (12211580700).

Almost surely, 2^71604268521 is an apocalyptic number.

It is an amenable number.

71604268521 is a deficient number, since it is larger than the sum of its proper divisors (26088377079).

71604268521 is a wasteful number, since it uses less digits than its factorization.

71604268521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555071895.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 71604268521 in words is "seventy-one billion, six hundred four million, two hundred sixty-eight thousand, five hundred twenty-one".