820332646669 has 8 divisors (see below), whose sum is σ = 831905759232. Its totient is φ = 808760065680.

The previous prime is 820332646619. The next prime is 820332646703. The reversal of 820332646669 is 966646233028.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 820332646669 - 2¹⁹ = 820332122381 is a prime.

It is a super-2 number, since 2×820332646669² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820332646619) 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, 3783412 + ... + 3994354.

It is an arithmetic number, because the mean of its divisors is an integer number (103988219904).

Almost surely, 2^820332646669 is an apocalyptic number.

It is an amenable number.

820332646669 is a deficient number, since it is larger than the sum of its proper divisors (11573112563).

820332646669 is a wasteful number, since it uses less digits than its factorization.

820332646669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265787.

The product of its (nonzero) digits is 13436928, while the sum is 55.

The spelling of 820332646669 in words is "eight hundred twenty billion, three hundred thirty-two million, six hundred forty-six thousand, six hundred sixty-nine".