71505421437 has 16 divisors (see below), whose sum is σ = 101506571712. Its totient is φ = 44618261760.

The previous prime is 71505421399. The next prime is 71505421447. The reversal of 71505421437 is 73412450517.

It is not a de Polignac number, because 71505421437 - 2⁶ = 71505421373 is a prime.

It is a super-2 number, since 2×71505421437² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71505421395 and 71505421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71505421447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3863883 + ... + 3882344.

It is an arithmetic number, because the mean of its divisors is an integer number (6344160732).

Almost surely, 2^71505421437 is an apocalyptic number.

It is an amenable number.

71505421437 is a deficient number, since it is larger than the sum of its proper divisors (30001150275).

71505421437 is a wasteful number, since it uses less digits than its factorization.

71505421437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7746428.

The product of its (nonzero) digits is 117600, while the sum is 39.

The spelling of 71505421437 in words is "seventy-one billion, five hundred five million, four hundred twenty-one thousand, four hundred thirty-seven".