866763832003640 has 32 divisors (see below), whose sum is σ = 2064937364480880. Its totient is φ = 326311089695232.

The previous prime is 866763832003603. The next prime is 866763832003673. The reversal of 866763832003640 is 46300238367668.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637326346382 + ... + 637326347741.

Almost surely, 2^{866763832003640} is an apocalyptic number.

It is an amenable number.

866763832003640 is an abundant number, since it is smaller than the sum of its proper divisors (1198173532477240).

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

866763832003640 is a wasteful number, since it uses less digits than its factorization.

866763832003640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274652694151 (or 1274652694147 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 62.

The spelling of 866763832003640 in words is "eight hundred sixty-six trillion, seven hundred sixty-three billion, eight hundred thirty-two million, three thousand, six hundred forty".