820765715610 has 32 divisors (see below), whose sum is σ = 1969883763840. Its totient is φ = 218865741248.

The previous prime is 820765715579. The next prime is 820765715629. The reversal of 820765715610 is 16517567028.

It is a self number, because there is not a number n which added to its sum of digits gives 820765715610.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1086376 + ... + 1679804.

It is an arithmetic number, because the mean of its divisors is an integer number (61558867620).

Almost surely, 2^820765715610 is an apocalyptic number.

820765715610 is an abundant number, since it is smaller than the sum of its proper divisors (1149118048230).

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

820765715610 is a wasteful number, since it uses less digits than its factorization.

820765715610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639542.

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 820765715610 in words is "eight hundred twenty billion, seven hundred sixty-five million, seven hundred fifteen thousand, six hundred ten".