866786274780425 has 12 divisors (see below), whose sum is σ = 1095094508667660. Its totient is φ = 680345453411520.

The previous prime is 866786274780313. The next prime is 866786274780509. The reversal of 866786274780425 is 524087472687668.

It can be written as a sum of positive squares in 6 ways, for example, as 36510634014409 + 830275640766016 = 6042403^2 + 28814504^2 .

It is not a de Polignac number, because 866786274780425 - 2¹² = 866786274776329 is a prime.

It is a super-3 number, since 3×866786274780425³ (a number of 46 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 866786274780425.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 327089158970 + ... + 327089161619.

It is an arithmetic number, because the mean of its divisors is an integer number (91257875722305).

Almost surely, 2^{866786274780425} is an apocalyptic number.

It is an amenable number.

866786274780425 is a deficient number, since it is larger than the sum of its proper divisors (228308233887235).

866786274780425 is a wasteful number, since it uses less digits than its factorization.

866786274780425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654178320652 (or 654178320647 counting only the distinct ones).

The product of its (nonzero) digits is 12138577920, while the sum is 80.

The spelling of 866786274780425 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-four million, seven hundred eighty thousand, four hundred twenty-five".