71607493721 has 16 divisors (see below), whose sum is σ = 81001431360. Its totient is φ = 62895191040.

The previous prime is 71607493669. The next prime is 71607493747. The reversal of 71607493721 is 12739470617.

It is a de Polignac number, because none of the positive numbers 2^k-71607493721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71607493781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1632800 + ... + 1676081.

It is an arithmetic number, because the mean of its divisors is an integer number (5062589460).

Almost surely, 2^71607493721 is an apocalyptic number.

It is an amenable number.

71607493721 is a deficient number, since it is larger than the sum of its proper divisors (9393937639).

71607493721 is a wasteful number, since it uses less digits than its factorization.

71607493721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308984.

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 71607493721 in words is "seventy-one billion, six hundred seven million, four hundred ninety-three thousand, seven hundred twenty-one".