26177240261 has 4 divisors (see below), whose sum is σ = 26182176300. Its totient is φ = 26172304224.

The previous prime is 26177240251. The next prime is 26177240321. The reversal of 26177240261 is 16204277162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4130632900 + 22046607361 = 64270^2 + 148481^2 .

It is a cyclic number.

It is not a de Polignac number, because 26177240261 - 2⁶ = 26177240197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26177240251) 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, 2460056 + ... + 2470673.

It is an arithmetic number, because the mean of its divisors is an integer number (6545544075).

Almost surely, 2^26177240261 is an apocalyptic number.

It is an amenable number.

26177240261 is a deficient number, since it is larger than the sum of its proper divisors (4936039).

26177240261 is an equidigital number, since it uses as much as digits as its factorization.

26177240261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4936038.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 26177240261 in words is "twenty-six billion, one hundred seventy-seven million, two hundred forty thousand, two hundred sixty-one".