820653353850 has 48 divisors (see below), whose sum is σ = 2220240350880. Its totient is φ = 198946267200.

The previous prime is 820653353803. The next prime is 820653353851. The reversal of 820653353850 is 58353356028.

It is a self number, because there is not a number n which added to its sum of digits gives 820653353850.

It is not an unprimeable number, because it can be changed into a prime (820653353851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248681185 + ... + 248684484.

It is an arithmetic number, because the mean of its divisors is an integer number (46255007310).

Almost surely, 2^820653353850 is an apocalyptic number.

820653353850 is an abundant number, since it is smaller than the sum of its proper divisors (1399586997030).

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

820653353850 is a wasteful number, since it uses less digits than its factorization.

820653353850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497365695 (or 497365690 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 820653353850 in words is "eight hundred twenty billion, six hundred fifty-three million, three hundred fifty-three thousand, eight hundred fifty".