866051852571625 has 8 divisors (see below), whose sum is σ = 1080832712009544. Its totient is φ = 692841482057200.

The previous prime is 866051852571623. The next prime is 866051852571629. The reversal of 866051852571625 is 526175258150668.

It can be written as a sum of positive squares in 4 ways, for example, as 188312687407849 + 677739165163776 = 13722707^2 + 26033424^2 .

It is not a de Polignac number, because 866051852571625 - 2¹ = 866051852571623 is a prime.

It is a super-2 number, since 2×866051852571625² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866051852571623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3464207410162 + ... + 3464207410411.

It is an arithmetic number, because the mean of its divisors is an integer number (135104089001193).

Almost surely, 2^{866051852571625} is an apocalyptic number.

It is an amenable number.

866051852571625 is a deficient number, since it is larger than the sum of its proper divisors (214780859437919).

866051852571625 is an equidigital number, since it uses as much as digits as its factorization.

866051852571625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6928414820588 (or 6928414820578 counting only the distinct ones).

The product of its (nonzero) digits is 241920000, while the sum is 67.

The spelling of 866051852571625 in words is "eight hundred sixty-six trillion, fifty-one billion, eight hundred fifty-two million, five hundred seventy-one thousand, six hundred twenty-five".