2188898785 has 4 divisors (see below), whose sum is σ = 2626678548. Its totient is φ = 1751119024.

The previous prime is 2188898759. The next prime is 2188898791. The reversal of 2188898785 is 5878988812.

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 1216893456 + 972005329 = 34884^2 + 31177^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188898785 - 2²⁵ = 2155344353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218889874 + ... + 218889883.

It is an arithmetic number, because the mean of its divisors is an integer number (656669637).

Almost surely, 2^2188898785 is an apocalyptic number.

It is an amenable number.

2188898785 is a deficient number, since it is larger than the sum of its proper divisors (437779763).

2188898785 is an equidigital number, since it uses as much as digits as its factorization.

2188898785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437779762.

The product of its digits is 20643840, while the sum is 64.

The square root of 2188898785 is about 46785.6685855829. The cubic root of 2188898785 is about 1298.4001591876.

The spelling of 2188898785 in words is "two billion, one hundred eighty-eight million, eight hundred ninety-eight thousand, seven hundred eighty-five".