2690198785 has 4 divisors (see below), whose sum is σ = 3228238548. Its totient is φ = 2152159024.

The previous prime is 2690198767. The next prime is 2690198801. The reversal of 2690198785 is 5878910962.

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 1537188849 + 1153009936 = 39207^2 + 33956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2690198785 - 2¹⁷ = 2690067713 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269019874 + ... + 269019883.

It is an arithmetic number, because the mean of its divisors is an integer number (807059637).

Almost surely, 2^2690198785 is an apocalyptic number.

It is an amenable number.

2690198785 is a deficient number, since it is larger than the sum of its proper divisors (538039763).

2690198785 is an equidigital number, since it uses as much as digits as its factorization.

2690198785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538039762.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The square root of 2690198785 is about 51867.1262458216. The cubic root of 2690198785 is about 1390.7896734402.

The spelling of 2690198785 in words is "two billion, six hundred ninety million, one hundred ninety-eight thousand, seven hundred eighty-five".