389199649661 has 2 divisors, whose sum is σ = 389199649662. Its totient is φ = 389199649660.

The previous prime is 389199649651. The next prime is 389199649757. The reversal of 389199649661 is 166946991983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344891925625 + 44307724036 = 587275^2 + 210494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389199649661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389199649651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194599824830 + 194599824831.

It is an arithmetic number, because the mean of its divisors is an integer number (194599824831).

Almost surely, 2^389199649661 is an apocalyptic number.

It is an amenable number.

389199649661 is a deficient number, since it is larger than the sum of its proper divisors (1).

389199649661 is an equidigital number, since it uses as much as digits as its factorization.

389199649661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136048896, while the sum is 71.

The spelling of 389199649661 in words is "three hundred eighty-nine billion, one hundred ninety-nine million, six hundred forty-nine thousand, six hundred sixty-one".