71205250161 has 4 divisors (see below), whose sum is σ = 94940333552. Its totient is φ = 47470166772.

The previous prime is 71205250111. The next prime is 71205250169. The reversal of 71205250161 is 16105250217.

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 not a de Polignac number, because 71205250161 - 2¹³ = 71205241969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71205250169) 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, 11867541691 + ... + 11867541696.

It is an arithmetic number, because the mean of its divisors is an integer number (23735083388).

Almost surely, 2^71205250161 is an apocalyptic number.

It is an amenable number.

71205250161 is a deficient number, since it is larger than the sum of its proper divisors (23735083391).

71205250161 is a wasteful number, since it uses less digits than its factorization.

71205250161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23735083390.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 71205250161 in words is "seventy-one billion, two hundred five million, two hundred fifty thousand, one hundred sixty-one".