102802180209689 has 2 divisors, whose sum is σ = 102802180209690. Its totient is φ = 102802180209688.

The previous prime is 102802180209661. The next prime is 102802180209709. The reversal of 102802180209689 is 986902081208201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57905707776400 + 44896472433289 = 7609580^2 + 6700483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102802180209689 is a prime.

It is not a weakly prime, because it can be changed into another prime (102802180209089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51401090104844 + 51401090104845.

It is an arithmetic number, because the mean of its divisors is an integer number (51401090104845).

Almost surely, 2^{102802180209689} is an apocalyptic number.

It is an amenable number.

102802180209689 is a deficient number, since it is larger than the sum of its proper divisors (1).

102802180209689 is an equidigital number, since it uses as much as digits as its factorization.

102802180209689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 56.

The spelling of 102802180209689 in words is "one hundred two trillion, eight hundred two billion, one hundred eighty million, two hundred nine thousand, six hundred eighty-nine".