1617640043389 has 2 divisors, whose sum is σ = 1617640043390. Its totient is φ = 1617640043388.

The previous prime is 1617640043333. The next prime is 1617640043413. The reversal of 1617640043389 is 9833400467161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1225300666489 + 392339376900 = 1106933^2 + 626370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617640043389 - 2¹³ = 1617640035197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1617640043329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808820021694 + 808820021695.

It is an arithmetic number, because the mean of its divisors is an integer number (808820021695).

Almost surely, 2^{1617640043389} is an apocalyptic number.

It is an amenable number.

1617640043389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617640043389 is an equidigital number, since it uses as much as digits as its factorization.

1617640043389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 1617640043389 in words is "one trillion, six hundred seventeen billion, six hundred forty million, forty-three thousand, three hundred eighty-nine".