866761280451605 has 64 divisors (see below), whose sum is σ = 1328754701514240. Its totient is φ = 526996818124800.

The previous prime is 866761280451581. The next prime is 866761280451631. The reversal of 866761280451605 is 506154082167668.

It is not a de Polignac number, because 866761280451605 - 2³⁶ = 866692560974869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50574701 + ... + 65508189.

It is an arithmetic number, because the mean of its divisors is an integer number (20761792211160).

Almost surely, 2^{866761280451605} is an apocalyptic number.

It is an amenable number.

866761280451605 is a deficient number, since it is larger than the sum of its proper divisors (461993421062635).

866761280451605 is a wasteful number, since it uses less digits than its factorization.

866761280451605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14937230.

The product of its (nonzero) digits is 116121600, while the sum is 65.

The spelling of 866761280451605 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred eighty million, four hundred fifty-one thousand, six hundred five".