71253310640 has 20 divisors (see below), whose sum is σ = 165663947424. Its totient is φ = 28501324224.

The previous prime is 71253310631. The next prime is 71253310649. The reversal of 71253310640 is 4601335217.

It is an interprime number because it is at equal distance from previous prime (71253310631) and next prime (71253310649).

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 71253310597 and 71253310606.

It is not an unprimeable number, because it can be changed into a prime (71253310649) 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, 445333112 + ... + 445333271.

Almost surely, 2^71253310640 is an apocalyptic number.

It is an amenable number.

71253310640 is an abundant number, since it is smaller than the sum of its proper divisors (94410636784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71253310640 is a wasteful number, since it uses less digits than its factorization.

71253310640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890666396 (or 890666390 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 71253310640 its reverse (4601335217), we get a palindrome (75854645857).

The spelling of 71253310640 in words is "seventy-one billion, two hundred fifty-three million, three hundred ten thousand, six hundred forty".