26506321187 has 4 divisors (see below), whose sum is σ = 26841844320. Its totient is φ = 26170798056.

The previous prime is 26506321169. The next prime is 26506321211. The reversal of 26506321187 is 78112360562.

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

It is a cyclic number.

It is not a de Polignac number, because 26506321187 - 2¹⁶ = 26506255651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26506323187) 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, 167761448 + ... + 167761605.

It is an arithmetic number, because the mean of its divisors is an integer number (6710461080).

Almost surely, 2^26506321187 is an apocalyptic number.

26506321187 is a deficient number, since it is larger than the sum of its proper divisors (335523133).

26506321187 is an equidigital number, since it uses as much as digits as its factorization.

26506321187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335523132.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 26506321187 in words is "twenty-six billion, five hundred six million, three hundred twenty-one thousand, one hundred eighty-seven".