26171620161 has 4 divisors (see below), whose sum is σ = 34895493552. Its totient is φ = 17447746772.

The previous prime is 26171620117. The next prime is 26171620171. The reversal of 26171620161 is 16102617162.

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 26171620161 - 2¹³ = 26171611969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26171620171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4361936691 + ... + 4361936696.

It is an arithmetic number, because the mean of its divisors is an integer number (8723873388).

Almost surely, 2^26171620161 is an apocalyptic number.

It is an amenable number.

26171620161 is a deficient number, since it is larger than the sum of its proper divisors (8723873391).

26171620161 is an equidigital number, since it uses as much as digits as its factorization.

26171620161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8723873390.

The product of its (nonzero) digits is 6048, while the sum is 33.

The spelling of 26171620161 in words is "twenty-six billion, one hundred seventy-one million, six hundred twenty thousand, one hundred sixty-one".