805521617940 has 96 divisors (see below), whose sum is σ = 2451658285440. Its totient is φ = 196429118976.

The previous prime is 805521617893. The next prime is 805521617947. The reversal of 805521617940 is 49716125508.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 805521617940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805521617947) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4742335 + ... + 4909254.

It is an arithmetic number, because the mean of its divisors is an integer number (25538107140).

Almost surely, 2^805521617940 is an apocalyptic number.

It is an amenable number.

805521617940 is an abundant number, since it is smaller than the sum of its proper divisors (1646136667500).

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

805521617940 is a wasteful number, since it uses less digits than its factorization.

805521617940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9651721 (or 9651719 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 805521617940 in words is "eight hundred five billion, five hundred twenty-one million, six hundred seventeen thousand, nine hundred forty".