71906508136321 has 4 divisors (see below), whose sum is σ = 74226072914944. Its totient is φ = 69586943357700.

The previous prime is 71906508136283. The next prime is 71906508136343. The reversal of 71906508136321 is 12363180560917.

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 not a de Polignac number, because 71906508136321 - 2¹⁹ = 71906507612033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71906508136361) 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, 1159782389265 + ... + 1159782389326.

It is an arithmetic number, because the mean of its divisors is an integer number (18556518228736).

Almost surely, 2^{71906508136321} is an apocalyptic number.

It is an amenable number.

71906508136321 is a deficient number, since it is larger than the sum of its proper divisors (2319564778623).

71906508136321 is a wasteful number, since it uses less digits than its factorization.

71906508136321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319564778622.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 71906508136321 in words is "seventy-one trillion, nine hundred six billion, five hundred eight million, one hundred thirty-six thousand, three hundred twenty-one".