102355020805 has 4 divisors (see below), whose sum is σ = 122826024972. Its totient is φ = 81884016640.

The previous prime is 102355020793. The next prime is 102355020851. The reversal of 102355020805 is 508020553201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45634358884 + 56720661921 = 213622^2 + 238161^2 .

It is not a de Polignac number, because 102355020805 - 2⁹ = 102355020293 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10235502076 + ... + 10235502085.

It is an arithmetic number, because the mean of its divisors is an integer number (30706506243).

Almost surely, 2^102355020805 is an apocalyptic number.

It is an amenable number.

102355020805 is a deficient number, since it is larger than the sum of its proper divisors (20471004167).

102355020805 is an equidigital number, since it uses as much as digits as its factorization.

102355020805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20471004166.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 102355020805 in words is "one hundred two billion, three hundred fifty-five million, twenty thousand, eight hundred five".