649345081579 has 4 divisors (see below), whose sum is σ = 652744794240. Its totient is φ = 645945368920.

The previous prime is 649345081571. The next prime is 649345081621. The reversal of 649345081579 is 975180543946.

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 649345081579 - 2³ = 649345081571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649345081571) 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, 1699856044 + ... + 1699856425.

It is an arithmetic number, because the mean of its divisors is an integer number (163186198560).

Almost surely, 2^649345081579 is an apocalyptic number.

649345081579 is a deficient number, since it is larger than the sum of its proper divisors (3399712661).

649345081579 is a wasteful number, since it uses less digits than its factorization.

649345081579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399712660.

The product of its (nonzero) digits is 32659200, while the sum is 61.

The spelling of 649345081579 in words is "six hundred forty-nine billion, three hundred forty-five million, eighty-one thousand, five hundred seventy-nine".