71164016639 has 4 divisors (see below), whose sum is σ = 72138866256. Its totient is φ = 70189167024.

The previous prime is 71164016597. The next prime is 71164016657. The reversal of 71164016639 is 93661046117.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71164016639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71164016639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71164016669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487424699 + ... + 487424844.

It is an arithmetic number, because the mean of its divisors is an integer number (18034716564).

Almost surely, 2^71164016639 is an apocalyptic number.

71164016639 is a deficient number, since it is larger than the sum of its proper divisors (974849617).

71164016639 is an equidigital number, since it uses as much as digits as its factorization.

71164016639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974849616.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 71164016639 in words is "seventy-one billion, one hundred sixty-four million, sixteen thousand, six hundred thirty-nine".