189718765633 has 2 divisors, whose sum is σ = 189718765634. Its totient is φ = 189718765632.

The previous prime is 189718765597. The next prime is 189718765651. The reversal of 189718765633 is 336567817981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106963010704 + 82755754929 = 327052^2 + 287673^2 .

It is a cyclic number.

It is not a de Polignac number, because 189718765633 - 2⁹ = 189718765121 is a prime.

It is not a weakly prime, because it can be changed into another prime (189718765693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94859382816 + 94859382817.

It is an arithmetic number, because the mean of its divisors is an integer number (94859382817).

Almost surely, 2^189718765633 is an apocalyptic number.

It is an amenable number.

189718765633 is a deficient number, since it is larger than the sum of its proper divisors (1).

189718765633 is an equidigital number, since it uses as much as digits as its factorization.

189718765633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 64.

The spelling of 189718765633 in words is "one hundred eighty-nine billion, seven hundred eighteen million, seven hundred sixty-five thousand, six hundred thirty-three".