2185778290099 has 2 divisors, whose sum is σ = 2185778290100. Its totient is φ = 2185778290098.

The previous prime is 2185778290067. The next prime is 2185778290153. The reversal of 2185778290099 is 9900928775812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2185778290099 - 2⁵ = 2185778290067 is a prime.

It is not a weakly prime, because it can be changed into another prime (2185778290009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092889145049 + 1092889145050.

It is an arithmetic number, because the mean of its divisors is an integer number (1092889145050).

Almost surely, 2^{2185778290099} is an apocalyptic number.

2185778290099 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185778290099 is an equidigital number, since it uses as much as digits as its factorization.

2185778290099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 67.

The spelling of 2185778290099 in words is "two trillion, one hundred eighty-five billion, seven hundred seventy-eight million, two hundred ninety thousand, ninety-nine".