71392978417 has 2 divisors, whose sum is σ = 71392978418. Its totient is φ = 71392978416.

The previous prime is 71392978411. The next prime is 71392978453. The reversal of 71392978417 is 71487929317.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63807265201 + 7585713216 = 252601^2 + 87096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71392978417 is a prime.

It is not a weakly prime, because it can be changed into another prime (71392978411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35696489208 + 35696489209.

It is an arithmetic number, because the mean of its divisors is an integer number (35696489209).

Almost surely, 2^71392978417 is an apocalyptic number.

It is an amenable number.

71392978417 is a deficient number, since it is larger than the sum of its proper divisors (1).

71392978417 is an equidigital number, since it uses as much as digits as its factorization.

71392978417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 58.

The spelling of 71392978417 in words is "seventy-one billion, three hundred ninety-two million, nine hundred seventy-eight thousand, four hundred seventeen".