805366660000 has 240 divisors, whose sum is σ = 2295416781504. Its totient is φ = 272339712000.

The previous prime is 805366659971. The next prime is 805366660001. The reversal of 805366660000 is 66663508.

It is a super-4 number, since 4×805366660000⁴ (a number of 49 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (805366660001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10180599 + ... + 10259401.

Almost surely, 2^805366660000 is an apocalyptic number.

805366660000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 805366660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1147708390752).

805366660000 is an abundant number, since it is smaller than the sum of its proper divisors (1490050121504).

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

805366660000 is an equidigital number, since it uses as much as digits as its factorization.

805366660000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78913 (or 78890 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 805366660000 in words is "eight hundred five billion, three hundred sixty-six million, six hundred sixty thousand".