821104797646 has 64 divisors (see below), whose sum is σ = 1456977456000. Its totient is φ = 339713961984.

The previous prime is 821104797637. The next prime is 821104797659. The reversal of 821104797646 is 646797401128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75401370 + ... + 75412258.

It is an arithmetic number, because the mean of its divisors is an integer number (22765272750).

Almost surely, 2^821104797646 is an apocalyptic number.

821104797646 is a deficient number, since it is larger than the sum of its proper divisors (635872658354).

821104797646 is a wasteful number, since it uses less digits than its factorization.

821104797646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12061.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 821104797646 in words is "eight hundred twenty-one billion, one hundred four million, seven hundred ninety-seven thousand, six hundred forty-six".