171605196551 has 2 divisors, whose sum is σ = 171605196552. Its totient is φ = 171605196550.

The previous prime is 171605196547. The next prime is 171605196589. The reversal of 171605196551 is 155691506171.

It is a weak prime.

It is an emirp because it is prime and its reverse (155691506171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171605196551 - 2² = 171605196547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171605196496 and 171605196505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171605196251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85802598275 + 85802598276.

It is an arithmetic number, because the mean of its divisors is an integer number (85802598276).

Almost surely, 2^171605196551 is an apocalyptic number.

171605196551 is a deficient number, since it is larger than the sum of its proper divisors (1).

171605196551 is an equidigital number, since it uses as much as digits as its factorization.

171605196551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 283500, while the sum is 47.

The spelling of 171605196551 in words is "one hundred seventy-one billion, six hundred five million, one hundred ninety-six thousand, five hundred fifty-one".