71604208891 has 2 divisors, whose sum is σ = 71604208892. Its totient is φ = 71604208890.

The previous prime is 71604208847. The next prime is 71604208903. The reversal of 71604208891 is 19880240617.

It is a strong prime.

It is an emirp because it is prime and its reverse (19880240617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71604208891 - 2³¹ = 69456725243 is a prime.

It is not a weakly prime, because it can be changed into another prime (71604208801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35802104445 + 35802104446.

It is an arithmetic number, because the mean of its divisors is an integer number (35802104446).

Almost surely, 2^71604208891 is an apocalyptic number.

71604208891 is a deficient number, since it is larger than the sum of its proper divisors (1).

71604208891 is an equidigital number, since it uses as much as digits as its factorization.

71604208891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 71604208891 in words is "seventy-one billion, six hundred four million, two hundred eight thousand, eight hundred ninety-one".