71378202517 has 8 divisors (see below), whose sum is σ = 72191298456. Its totient is φ = 70568289792.

The previous prime is 71378202509. The next prime is 71378202523. The reversal of 71378202517 is 71520287317.

It can be written as a sum of positive squares in 4 ways, for example, as 7020093796 + 64358108721 = 83786^2 + 253689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71378202517 - 2³ = 71378202509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71378206517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750688 + ... + 840409.

It is an arithmetic number, because the mean of its divisors is an integer number (9023912307).

Almost surely, 2^71378202517 is an apocalyptic number.

It is an amenable number.

71378202517 is a deficient number, since it is larger than the sum of its proper divisors (813095939).

71378202517 is a wasteful number, since it uses less digits than its factorization.

71378202517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591607.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 71378202517 in words is "seventy-one billion, three hundred seventy-eight million, two hundred two thousand, five hundred seventeen".