26491870061 has 4 divisors (see below), whose sum is σ = 26505450624. Its totient is φ = 26478289500.

The previous prime is 26491870037. The next prime is 26491870079. The reversal of 26491870061 is 16007819462.

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 a de Polignac number, because none of the positive numbers 2^k-26491870061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 26491869994 and 26491870021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26491870001) 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, 6787355 + ... + 6791256.

It is an arithmetic number, because the mean of its divisors is an integer number (6626362656).

Almost surely, 2^26491870061 is an apocalyptic number.

It is an amenable number.

26491870061 is a deficient number, since it is larger than the sum of its proper divisors (13580563).

26491870061 is a wasteful number, since it uses less digits than its factorization.

26491870061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13580562.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 26491870061 in words is "twenty-six billion, four hundred ninety-one million, eight hundred seventy thousand, sixty-one".