71641371251 has 4 divisors (see below), whose sum is σ = 72005033232. Its totient is φ = 71277709272.

The previous prime is 71641371247. The next prime is 71641371257. The reversal of 71641371251 is 15217314617.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 71641371251 - 2² = 71641371247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71641371257) 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, 181830695 + ... + 181831088.

It is an arithmetic number, because the mean of its divisors is an integer number (18001258308).

Almost surely, 2^71641371251 is an apocalyptic number.

71641371251 is a deficient number, since it is larger than the sum of its proper divisors (363661981).

71641371251 is a wasteful number, since it uses less digits than its factorization.

71641371251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363661980.

The product of its digits is 35280, while the sum is 38.

Adding to 71641371251 its reverse (15217314617), we get a palindrome (86858685868).

The spelling of 71641371251 in words is "seventy-one billion, six hundred forty-one million, three hundred seventy-one thousand, two hundred fifty-one".