1639787969213 has 2 divisors, whose sum is σ = 1639787969214. Its totient is φ = 1639787969212.

The previous prime is 1639787969191. The next prime is 1639787969219. The reversal of 1639787969213 is 3129697879361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1424294259844 + 215493709369 = 1193438^2 + 464213^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639787969213 - 2¹⁸ = 1639787707069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1639787969219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819893984606 + 819893984607.

It is an arithmetic number, because the mean of its divisors is an integer number (819893984607).

Almost surely, 2^{1639787969213} is an apocalyptic number.

It is an amenable number.

1639787969213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639787969213 is an equidigital number, since it uses as much as digits as its factorization.

1639787969213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185177664, while the sum is 71.

The spelling of 1639787969213 in words is "one trillion, six hundred thirty-nine billion, seven hundred eighty-seven million, nine hundred sixty-nine thousand, two hundred thirteen".