163642455340373 has 2 divisors, whose sum is σ = 163642455340374. Its totient is φ = 163642455340372.

The previous prime is 163642455340349. The next prime is 163642455340381. The reversal of 163642455340373 is 373043554246361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108046836015364 + 55595619325009 = 10394558^2 + 7456247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163642455340373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163642455345373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81821227670186 + 81821227670187.

It is an arithmetic number, because the mean of its divisors is an integer number (81821227670187).

Almost surely, 2^{163642455340373} is an apocalyptic number.

It is an amenable number.

163642455340373 is a deficient number, since it is larger than the sum of its proper divisors (1).

163642455340373 is an equidigital number, since it uses as much as digits as its factorization.

163642455340373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65318400, while the sum is 56.

The spelling of 163642455340373 in words is "one hundred sixty-three trillion, six hundred forty-two billion, four hundred fifty-five million, three hundred forty thousand, three hundred seventy-three".