26206467561 has 6 divisors (see below), whose sum is σ = 37853786490. Its totient is φ = 17470978368.

The previous prime is 26206467541. The next prime is 26206467583. The reversal of 26206467561 is 16576460262.

26206467561 is a `hidden beast` number, since 2 + 6 + 20 + 6 + 4 + 67 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21193827561 + 5012640000 = 145581^2 + 70800^2 .

It is not a de Polignac number, because 26206467561 - 2¹⁰ = 26206466537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26206467541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1455914856 + ... + 1455914873.

It is an arithmetic number, because the mean of its divisors is an integer number (6308964415).

Almost surely, 2^26206467561 is an apocalyptic number.

It is an amenable number.

26206467561 is a deficient number, since it is larger than the sum of its proper divisors (11647318929).

26206467561 is a wasteful number, since it uses less digits than its factorization.

26206467561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911829735 (or 2911829732 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 26206467561 in words is "twenty-six billion, two hundred six million, four hundred sixty-seven thousand, five hundred sixty-one".