71507857943 has 4 divisors (see below), whose sum is σ = 71527235208. Its totient is φ = 71488480680.

The previous prime is 71507857937. The next prime is 71507857957. The reversal of 71507857943 is 34975870517.

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 71507857943 - 2¹⁰ = 71507856919 is a prime.

It is a super-2 number, since 2×71507857943² (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 (71507857913) 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, 9683096 + ... + 9690477.

It is an arithmetic number, because the mean of its divisors is an integer number (17881808802).

Almost surely, 2^71507857943 is an apocalyptic number.

71507857943 is a deficient number, since it is larger than the sum of its proper divisors (19377265).

71507857943 is a wasteful number, since it uses less digits than its factorization.

71507857943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19377264.

The product of its (nonzero) digits is 7408800, while the sum is 56.

The spelling of 71507857943 in words is "seventy-one billion, five hundred seven million, eight hundred fifty-seven thousand, nine hundred forty-three".