866507667555222 has 192 divisors, whose sum is σ = 2350833387042816. Its totient is φ = 224092256762880.

The previous prime is 866507667555199. The next prime is 866507667555247. The reversal of 866507667555222 is 222555766705668.

866507667555222 is a `hidden beast` number, since 8 + 6 + 6 + 5 + 0 + 7 + 6 + 67 + 5 + 552 + 2 + 2 = 666.

It is a super-2 number, since 2×866507667555222² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14801188083 + ... + 14801246625.

It is an arithmetic number, because the mean of its divisors is an integer number (12243923890848).

Almost surely, 2^{866507667555222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866507667555222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175416693521408).

866507667555222 is an abundant number, since it is smaller than the sum of its proper divisors (1484325719487594).

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

866507667555222 is a wasteful number, since it uses less digits than its factorization.

866507667555222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104635 (or 104632 counting only the distinct ones).

The product of its (nonzero) digits is 2540160000, while the sum is 72.

The spelling of 866507667555222 in words is "eight hundred sixty-six trillion, five hundred seven billion, six hundred sixty-seven million, five hundred fifty-five thousand, two hundred twenty-two".