26861545865709 has 48 divisors (see below), whose sum is σ = 42432663297024. Its totient is φ = 16300977062400.

The previous prime is 26861545865689. The next prime is 26861545865711. The reversal of 26861545865709 is 90756854516862.

26861545865709 is a `hidden beast` number, since 2 + 6 + 8 + 6 + 1 + 5 + 45 + 8 + 6 + 570 + 9 = 666.

It is not a de Polignac number, because 26861545865709 - 2¹⁵ = 26861545832941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26861545875709) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6357304 + ... + 9702494.

It is an arithmetic number, because the mean of its divisors is an integer number (884013818688).

Almost surely, 2^{26861545865709} is an apocalyptic number.

It is an amenable number.

26861545865709 is a deficient number, since it is larger than the sum of its proper divisors (15571117431315).

26861545865709 is a wasteful number, since it uses less digits than its factorization.

26861545865709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346938 (or 3346935 counting only the distinct ones).

The product of its (nonzero) digits is 870912000, while the sum is 72.

The spelling of 26861545865709 in words is "twenty-six trillion, eight hundred sixty-one billion, five hundred forty-five million, eight hundred sixty-five thousand, seven hundred nine".