64598809649 has 4 divisors (see below), whose sum is σ = 70471428720. Its totient is φ = 58726190580.

The previous prime is 64598809637. The next prime is 64598809663. The reversal of 64598809649 is 94690889546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64598809649 - 2⁸ = 64598809393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64598809679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2936309519 + ... + 2936309540.

It is an arithmetic number, because the mean of its divisors is an integer number (17617857180).

Almost surely, 2^64598809649 is an apocalyptic number.

It is an amenable number.

64598809649 is a deficient number, since it is larger than the sum of its proper divisors (5872619071).

64598809649 is a wasteful number, since it uses less digits than its factorization.

64598809649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5872619070.

The product of its (nonzero) digits is 134369280, while the sum is 68.

The spelling of 64598809649 in words is "sixty-four billion, five hundred ninety-eight million, eight hundred nine thousand, six hundred forty-nine".