2649190685 has 4 divisors (see below), whose sum is σ = 3179028828. Its totient is φ = 2119352544.

The previous prime is 2649190679. The next prime is 2649190721. The reversal of 2649190685 is 5860919462.

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 2023290361 + 625900324 = 44981^2 + 25018^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649190685 - 2⁸ = 2649190429 is a prime.

It is a super-2 number, since 2×2649190685² = 14036422570981538450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264919064 + ... + 264919073.

It is an arithmetic number, because the mean of its divisors is an integer number (794757207).

Almost surely, 2^2649190685 is an apocalyptic number.

It is an amenable number.

2649190685 is a deficient number, since it is larger than the sum of its proper divisors (529838143).

2649190685 is an equidigital number, since it uses as much as digits as its factorization.

2649190685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529838142.

The product of its (nonzero) digits is 933120, while the sum is 50.

The square root of 2649190685 is about 51470.2893424935. The cubic root of 2649190685 is about 1383.6866147907.

The spelling of 2649190685 in words is "two billion, six hundred forty-nine million, one hundred ninety thousand, six hundred eighty-five".