26173961487 has 20 divisors (see below), whose sum is σ = 39170920536. Its totient is φ = 17417378160.

The previous prime is 26173961453. The next prime is 26173961503. The reversal of 26173961487 is 78416937162.

26173961487 is a `hidden beast` number, since 2 + 6 + 1 + 73 + 96 + 1 + 487 = 666.

It is not a de Polignac number, because 26173961487 - 2²⁰ = 26172912911 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26173961417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 251064 + ... + 339677.

Almost surely, 2^26173961487 is an apocalyptic number.

26173961487 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

26173961487 is a deficient number, since it is larger than the sum of its proper divisors (12996959049).

26173961487 is an equidigital number, since it uses as much as digits as its factorization.

26173961487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591300 (or 591291 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 26173961487 in words is "twenty-six billion, one hundred seventy-three million, nine hundred sixty-one thousand, four hundred eighty-seven".