71006256631 has 4 divisors (see below), whose sum is σ = 71978945152. Its totient is φ = 70033568112.

The previous prime is 71006256613. The next prime is 71006256653. The reversal of 71006256631 is 13665260017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13665260017 = 251 ⋅54443267.

It is a cyclic number.

It is not a de Polignac number, because 71006256631 - 2²³ = 70997868023 is a prime.

It is a super-2 number, since 2×71006256631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71006256031) 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, 486344151 + ... + 486344296.

It is an arithmetic number, because the mean of its divisors is an integer number (17994736288).

Almost surely, 2^71006256631 is an apocalyptic number.

71006256631 is a deficient number, since it is larger than the sum of its proper divisors (972688521).

71006256631 is an equidigital number, since it uses as much as digits as its factorization.

71006256631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972688520.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 71006256631 in words is "seventy-one billion, six million, two hundred fifty-six thousand, six hundred thirty-one".