171003553649 has 2 divisors, whose sum is σ = 171003553650. Its totient is φ = 171003553648.

The previous prime is 171003553631. The next prime is 171003553687. The reversal of 171003553649 is 946355300171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107055259249 + 63948294400 = 327193^2 + 252880^2 .

It is an emirp because it is prime and its reverse (946355300171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171003553649 is a prime.

It is not a weakly prime, because it can be changed into another prime (171003553619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85501776824 + 85501776825.

It is an arithmetic number, because the mean of its divisors is an integer number (85501776825).

Almost surely, 2^171003553649 is an apocalyptic number.

It is an amenable number.

171003553649 is a deficient number, since it is larger than the sum of its proper divisors (1).

171003553649 is an equidigital number, since it uses as much as digits as its factorization.

171003553649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 44.

The spelling of 171003553649 in words is "one hundred seventy-one billion, three million, five hundred fifty-three thousand, six hundred forty-nine".