821476472781668 has 24 divisors (see below), whose sum is σ = 1569122358560064. Its totient is φ = 373196231876000.

The previous prime is 821476472781661. The next prime is 821476472781763. The reversal of 821476472781668 is 866187274674128.

It is not an unprimeable number, because it can be changed into a prime (821476472781661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5054038883 + ... + 5054201418.

It is an arithmetic number, because the mean of its divisors is an integer number (65380098273336).

Almost surely, 2^{821476472781668} is an apocalyptic number.

It is an amenable number.

821476472781668 is a deficient number, since it is larger than the sum of its proper divisors (747645885778396).

821476472781668 is a wasteful number, since it uses less digits than its factorization.

821476472781668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10108242163 (or 10108242161 counting only the distinct ones).

The product of its digits is 2427715584, while the sum is 77.

The spelling of 821476472781668 in words is "eight hundred twenty-one trillion, four hundred seventy-six billion, four hundred seventy-two million, seven hundred eighty-one thousand, six hundred sixty-eight".