866671480520 has 16 divisors (see below), whose sum is σ = 1950010831260. Its totient is φ = 346668592192.

The previous prime is 866671480517. The next prime is 866671480547. The reversal of 866671480520 is 25084176668.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 735275380324 + 131396100196 = 857482^2 + 362486^2 .

It is a super-2 number, since 2×866671480520² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10833393467 + ... + 10833393546.

Almost surely, 2^866671480520 is an apocalyptic number.

It is an amenable number.

866671480520 is an abundant number, since it is smaller than the sum of its proper divisors (1083339350740).

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

866671480520 is a wasteful number, since it uses less digits than its factorization.

866671480520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21666787024 (or 21666787020 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 866671480520 in words is "eight hundred sixty-six billion, six hundred seventy-one million, four hundred eighty thousand, five hundred twenty".