649255219789 has 8 divisors (see below), whose sum is σ = 749941858368. Its totient is φ = 555512487360.

The previous prime is 649255219787. The next prime is 649255219829. The reversal of 649255219789 is 987912552946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649255219789 - 2¹ = 649255219787 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 (649255219787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1735976337 + ... + 1735976710.

It is an arithmetic number, because the mean of its divisors is an integer number (93742732296).

Almost surely, 2^649255219789 is an apocalyptic number.

It is an amenable number.

649255219789 is a deficient number, since it is larger than the sum of its proper divisors (100686638579).

649255219789 is a wasteful number, since it uses less digits than its factorization.

649255219789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471953075.

The product of its digits is 97977600, while the sum is 67.

The spelling of 649255219789 in words is "six hundred forty-nine billion, two hundred fifty-five million, two hundred nineteen thousand, seven hundred eighty-nine".