189171375388693 has 2 divisors, whose sum is σ = 189171375388694. Its totient is φ = 189171375388692.

The previous prime is 189171375388691. The next prime is 189171375388729. The reversal of 189171375388693 is 396883573171981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169962378189444 + 19208997199249 = 13036962^2 + 4382807^2 .

It is a cyclic number.

It is not a de Polignac number, because 189171375388693 - 2¹ = 189171375388691 is a prime.

Together with 189171375388691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189171375388691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94585687694346 + 94585687694347.

It is an arithmetic number, because the mean of its divisors is an integer number (94585687694347).

Almost surely, 2^{189171375388693} is an apocalyptic number.

It is an amenable number.

189171375388693 is a deficient number, since it is larger than the sum of its proper divisors (1).

189171375388693 is an equidigital number, since it uses as much as digits as its factorization.

189171375388693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646023680, while the sum is 79.

The spelling of 189171375388693 in words is "one hundred eighty-nine trillion, one hundred seventy-one billion, three hundred seventy-five million, three hundred eighty-eight thousand, six hundred ninety-three".