1639252669321 has 2 divisors, whose sum is σ = 1639252669322. Its totient is φ = 1639252669320.

The previous prime is 1639252669303. The next prime is 1639252669333. The reversal of 1639252669321 is 1239662529361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478804355721 + 160448313600 = 1216061^2 + 400560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639252669321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1639252669361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819626334660 + 819626334661.

It is an arithmetic number, because the mean of its divisors is an integer number (819626334661).

Almost surely, 2^{1639252669321} is an apocalyptic number.

It is an amenable number.

1639252669321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639252669321 is an equidigital number, since it uses as much as digits as its factorization.

1639252669321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6298560, while the sum is 55.

The spelling of 1639252669321 in words is "one trillion, six hundred thirty-nine billion, two hundred fifty-two million, six hundred sixty-nine thousand, three hundred twenty-one".