649505757599 has 4 divisors (see below), whose sum is σ = 649515866736. Its totient is φ = 649495648464.

The previous prime is 649505757581. The next prime is 649505757613. The reversal of 649505757599 is 995757505946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649505757599 - 2¹⁶ = 649505692063 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 (649505753599) 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, 4957574 + ... + 5086899.

It is an arithmetic number, because the mean of its divisors is an integer number (162378966684).

Almost surely, 2^649505757599 is an apocalyptic number.

649505757599 is a deficient number, since it is larger than the sum of its proper divisors (10109137).

649505757599 is a wasteful number, since it uses less digits than its factorization.

649505757599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10109136.

The product of its (nonzero) digits is 535815000, while the sum is 71.

The spelling of 649505757599 in words is "six hundred forty-nine billion, five hundred five million, seven hundred fifty-seven thousand, five hundred ninety-nine".