16639253207579 has 4 divisors (see below), whose sum is σ = 16639270092984. Its totient is φ = 16639236322176.

The previous prime is 16639253207557. The next prime is 16639253207581. The reversal of 16639253207579 is 97570235293661.

It is a happy number.

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-16639253207579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16639253200579) 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, 6866477 + ... + 8968110.

It is an arithmetic number, because the mean of its divisors is an integer number (4159817523246).

Almost surely, 2^{16639253207579} is an apocalyptic number.

16639253207579 is a deficient number, since it is larger than the sum of its proper divisors (16885405).

16639253207579 is a wasteful number, since it uses less digits than its factorization.

16639253207579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16885404.

The product of its (nonzero) digits is 128595600, while the sum is 65.

The spelling of 16639253207579 in words is "sixteen trillion, six hundred thirty-nine billion, two hundred fifty-three million, two hundred seven thousand, five hundred seventy-nine".