163690188391 has 2 divisors, whose sum is σ = 163690188392. Its totient is φ = 163690188390.

The previous prime is 163690188317. The next prime is 163690188401. The reversal of 163690188391 is 193881096361.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163690188391 - 2²¹ = 163688091239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163690188191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81845094195 + 81845094196.

It is an arithmetic number, because the mean of its divisors is an integer number (81845094196).

Almost surely, 2^163690188391 is an apocalyptic number.

163690188391 is a deficient number, since it is larger than the sum of its proper divisors (1).

163690188391 is an equidigital number, since it uses as much as digits as its factorization.

163690188391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 163690188391 in words is "one hundred sixty-three billion, six hundred ninety million, one hundred eighty-eight thousand, three hundred ninety-one".