102005214865 has 4 divisors (see below), whose sum is σ = 122406257844. Its totient is φ = 81604171888.

The previous prime is 102005214851. The next prime is 102005214877. The reversal of 102005214865 is 568412500201.

It is a happy number.

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 11083667841 + 90921547024 = 105279^2 + 301532^2 .

It is a cyclic number.

It is not a de Polignac number, because 102005214865 - 2⁷ = 102005214737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102005214865.

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 3 ways as a sum of consecutive naturals, for example, 10200521482 + ... + 10200521491.

It is an arithmetic number, because the mean of its divisors is an integer number (30601564461).

Almost surely, 2^102005214865 is an apocalyptic number.

It is an amenable number.

102005214865 is a deficient number, since it is larger than the sum of its proper divisors (20401042979).

102005214865 is an equidigital number, since it uses as much as digits as its factorization.

102005214865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20401042978.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 102005214865 in words is "one hundred two billion, five million, two hundred fourteen thousand, eight hundred sixty-five".