71906078449 has 2 divisors, whose sum is σ = 71906078450. Its totient is φ = 71906078448.

The previous prime is 71906078399. The next prime is 71906078459. The reversal of 71906078449 is 94487060917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71199316224 + 706762225 = 266832^2 + 26585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71906078449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71906078449.

It is not a weakly prime, because it can be changed into another prime (71906078459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35953039224 + 35953039225.

It is an arithmetic number, because the mean of its divisors is an integer number (35953039225).

Almost surely, 2^71906078449 is an apocalyptic number.

It is an amenable number.

71906078449 is a deficient number, since it is larger than the sum of its proper divisors (1).

71906078449 is an equidigital number, since it uses as much as digits as its factorization.

71906078449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 71906078449 in words is "seventy-one billion, nine hundred six million, seventy-eight thousand, four hundred forty-nine".