71001425681 has 4 divisors (see below), whose sum is σ = 71199201600. Its totient is φ = 70803649764.

The previous prime is 71001425669. The next prime is 71001425711. The reversal of 71001425681 is 18652410017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71001425681 is a prime.

It is a super-2 number, since 2×71001425681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71001425581) 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, 98887421 + ... + 98888138.

It is an arithmetic number, because the mean of its divisors is an integer number (17799800400).

Almost surely, 2^71001425681 is an apocalyptic number.

It is an amenable number.

71001425681 is a deficient number, since it is larger than the sum of its proper divisors (197775919).

71001425681 is a wasteful number, since it uses less digits than its factorization.

71001425681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197775918.

The product of its (nonzero) digits is 13440, while the sum is 35.

Adding to 71001425681 its reverse (18652410017), we get a palindrome (89653835698).

The spelling of 71001425681 in words is "seventy-one billion, one million, four hundred twenty-five thousand, six hundred eighty-one".