20639398699 has 2 divisors, whose sum is σ = 20639398700. Its totient is φ = 20639398698.

The previous prime is 20639398693. The next prime is 20639398727. The reversal of 20639398699 is 99689393602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20639398699 - 2¹¹ = 20639396651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20639398699.

It is not a weakly prime, because it can be changed into another prime (20639398693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10319699349 + 10319699350.

It is an arithmetic number, because the mean of its divisors is an integer number (10319699350).

Almost surely, 2^20639398699 is an apocalyptic number.

20639398699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20639398699 is an equidigital number, since it uses as much as digits as its factorization.

20639398699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34012224, while the sum is 64.

The spelling of 20639398699 in words is "twenty billion, six hundred thirty-nine million, three hundred ninety-eight thousand, six hundred ninety-nine".