6537654218649 has 4 divisors (see below), whose sum is σ = 8716872291536. Its totient is φ = 4358436145764.

The previous prime is 6537654218549. The next prime is 6537654218743. The reversal of 6537654218649 is 9468124567356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6537654218649 - 2¹¹ = 6537654216601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6537654218649.

It is not an unprimeable number, because it can be changed into a prime (6537654218549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089609036439 + ... + 1089609036444.

It is an arithmetic number, because the mean of its divisors is an integer number (2179218072884).

Almost surely, 2^{6537654218649} is an apocalyptic number.

It is an amenable number.

6537654218649 is a deficient number, since it is larger than the sum of its proper divisors (2179218072887).

6537654218649 is a wasteful number, since it uses less digits than its factorization.

6537654218649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179218072886.

The product of its digits is 261273600, while the sum is 66.

The spelling of 6537654218649 in words is "six trillion, five hundred thirty-seven billion, six hundred fifty-four million, two hundred eighteen thousand, six hundred forty-nine".