26617515261 has 4 divisors (see below), whose sum is σ = 35490020352. Its totient is φ = 17745010172.

The previous prime is 26617515229. The next prime is 26617515271. The reversal of 26617515261 is 16251571662.

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 26617515261 - 2⁵ = 26617515229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26617515271) 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, 4436252541 + ... + 4436252546.

It is an arithmetic number, because the mean of its divisors is an integer number (8872505088).

Almost surely, 2^26617515261 is an apocalyptic number.

It is an amenable number.

26617515261 is a deficient number, since it is larger than the sum of its proper divisors (8872505091).

26617515261 is an equidigital number, since it uses as much as digits as its factorization.

26617515261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8872505090.

The product of its digits is 151200, while the sum is 42.

The spelling of 26617515261 in words is "twenty-six billion, six hundred seventeen million, five hundred fifteen thousand, two hundred sixty-one".