866786466006405 has 192 divisors, whose sum is σ = 1806106589134848. Its totient is φ = 375974295459840.

The previous prime is 866786466006403. The next prime is 866786466006437. The reversal of 866786466006405 is 504600664687668.

866786466006405 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 6 + 4 + 6 + 600 + 6 + 4 + 0 + 5 = 666.

It is not a de Polignac number, because 866786466006405 - 2¹ = 866786466006403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786466006403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6198744840 + ... + 6198884670.

It is an arithmetic number, because the mean of its divisors is an integer number (9406805151744).

Almost surely, 2^{866786466006405} is an apocalyptic number.

It is an amenable number.

866786466006405 is an abundant number, since it is smaller than the sum of its proper divisors (939320123128443).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866786466006405 is a wasteful number, since it uses less digits than its factorization.

866786466006405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146736 (or 146733 counting only the distinct ones).

The product of its (nonzero) digits is 1672151040, while the sum is 72.

The spelling of 866786466006405 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, four hundred sixty-six million, six thousand, four hundred five".