168071005071561 has 4 divisors (see below), whose sum is σ = 224094673428752. Its totient is φ = 112047336714372.

The previous prime is 168071005071521. The next prime is 168071005071583. The reversal of 168071005071561 is 165170500170861.

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 168071005071561 - 2¹⁹ = 168071004547273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168071005071561.

It is not an unprimeable number, because it can be changed into a prime (168071005071521) 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, 28011834178591 + ... + 28011834178596.

It is an arithmetic number, because the mean of its divisors is an integer number (56023668357188).

Almost surely, 2^{168071005071561} is an apocalyptic number.

It is an amenable number.

168071005071561 is a deficient number, since it is larger than the sum of its proper divisors (56023668357191).

168071005071561 is an equidigital number, since it uses as much as digits as its factorization.

168071005071561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56023668357190.

The product of its (nonzero) digits is 352800, while the sum is 48.

The spelling of 168071005071561 in words is "one hundred sixty-eight trillion, seventy-one billion, five million, seventy-one thousand, five hundred sixty-one".