2649188897 has 4 divisors (see below), whose sum is σ = 2805023556. Its totient is φ = 2493354240.

The previous prime is 2649188879. The next prime is 2649188951. The reversal of 2649188897 is 7988819462.

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 1545354721 + 1103834176 = 39311^2 + 33224^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649188897 - 2²⁴ = 2632411681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2649188807) by changing a digit.

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, 77917304 + ... + 77917337.

It is an arithmetic number, because the mean of its divisors is an integer number (701255889).

Almost surely, 2^2649188897 is an apocalyptic number.

It is an amenable number.

2649188897 is a deficient number, since it is larger than the sum of its proper divisors (155834659).

2649188897 is a wasteful number, since it uses less digits than its factorization.

2649188897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155834658.

The product of its digits is 13934592, while the sum is 62.

The square root of 2649188897 is about 51470.2719732468. The cubic root of 2649188897 is about 1383.6863034966.

The spelling of 2649188897 in words is "two billion, six hundred forty-nine million, one hundred eighty-eight thousand, eight hundred ninety-seven".