664676912539 has 4 divisors (see below), whose sum is σ = 668390191560. Its totient is φ = 660963633520.

The previous prime is 664676912477. The next prime is 664676912563. The reversal of 664676912539 is 935219676466.

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 664676912539 - 2¹³ = 664676904347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664676916539) 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, 1856639242 + ... + 1856639599.

It is an arithmetic number, because the mean of its divisors is an integer number (167097547890).

Almost surely, 2^664676912539 is an apocalyptic number.

664676912539 is a deficient number, since it is larger than the sum of its proper divisors (3713279021).

664676912539 is a wasteful number, since it uses less digits than its factorization.

664676912539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713279020.

The product of its digits is 88179840, while the sum is 64.

The spelling of 664676912539 in words is "six hundred sixty-four billion, six hundred seventy-six million, nine hundred twelve thousand, five hundred thirty-nine".