649025218339 has 4 divisors (see below), whose sum is σ = 654768804456. Its totient is φ = 643281632224.

The previous prime is 649025218277. The next prime is 649025218343. The reversal of 649025218339 is 933812520946.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649025218339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649025218739) 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, 2871792889 + ... + 2871793114.

It is an arithmetic number, because the mean of its divisors is an integer number (163692201114).

Almost surely, 2^649025218339 is an apocalyptic number.

649025218339 is a deficient number, since it is larger than the sum of its proper divisors (5743586117).

649025218339 is a wasteful number, since it uses less digits than its factorization.

649025218339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5743586116.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 649025218339 in words is "six hundred forty-nine billion, twenty-five million, two hundred eighteen thousand, three hundred thirty-nine".