649606834237 has 4 divisors (see below), whose sum is σ = 649609543900. Its totient is φ = 649604124576.

The previous prime is 649606834231. The next prime is 649606834241. The reversal of 649606834237 is 732438606946.

It is a happy number.

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 525413321316 + 124193512921 = 724854^2 + 352411^2 .

It is a cyclic number.

It is not a de Polignac number, because 649606834237 - 2⁷ = 649606834109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649606834231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956112 + ... + 1487737.

It is an arithmetic number, because the mean of its divisors is an integer number (162402385975).

Almost surely, 2^649606834237 is an apocalyptic number.

It is an amenable number.

649606834237 is a deficient number, since it is larger than the sum of its proper divisors (2709663).

649606834237 is a wasteful number, since it uses less digits than its factorization.

649606834237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709662.

The product of its (nonzero) digits is 31352832, while the sum is 58.

The spelling of 649606834237 in words is "six hundred forty-nine billion, six hundred six million, eight hundred thirty-four thousand, two hundred thirty-seven".