820860255105 has 16 divisors (see below), whose sum is σ = 1432774263744. Its totient is φ = 397992850880.

The previous prime is 820860255091. The next prime is 820860255119. The reversal of 820860255105 is 501552068028.

It is an interprime number because it is at equal distance from previous prime (820860255091) and next prime (820860255119).

It is not a de Polignac number, because 820860255105 - 2⁶ = 820860255041 is a prime.

It is a super-2 number, since 2×820860255105² (a number of 25 digits) contains 22 as substring.

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, 2487455154 + ... + 2487455483.

It is an arithmetic number, because the mean of its divisors is an integer number (89548391484).

Almost surely, 2^820860255105 is an apocalyptic number.

It is an amenable number.

820860255105 is a deficient number, since it is larger than the sum of its proper divisors (611914008639).

820860255105 is a wasteful number, since it uses less digits than its factorization.

820860255105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974910656.

The product of its (nonzero) digits is 192000, while the sum is 42.

The spelling of 820860255105 in words is "eight hundred twenty billion, eight hundred sixty million, two hundred fifty-five thousand, one hundred five".