866802636415651 has 16 divisors (see below), whose sum is σ = 933972832900800. Its totient is φ = 799702887634560.

The previous prime is 866802636415649. The next prime is 866802636415691. The reversal of 866802636415651 is 156514636208668.

It is not a de Polignac number, because 866802636415651 - 2¹ = 866802636415649 is a prime.

It is a super-2 number, since 2×866802636415651² (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 (866802636415621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4066544625 + ... + 4066757773.

It is an arithmetic number, because the mean of its divisors is an integer number (58373302056300).

Almost surely, 2^{866802636415651} is an apocalyptic number.

866802636415651 is a deficient number, since it is larger than the sum of its proper divisors (67170196485149).

866802636415651 is a wasteful number, since it uses less digits than its factorization.

866802636415651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376926.

The product of its (nonzero) digits is 298598400, while the sum is 67.

The spelling of 866802636415651 in words is "eight hundred sixty-six trillion, eight hundred two billion, six hundred thirty-six million, four hundred fifteen thousand, six hundred fifty-one".