171887053699 has 4 divisors (see below), whose sum is σ = 173141703864. Its totient is φ = 170632403536.

The previous prime is 171887053661. The next prime is 171887053727. The reversal of 171887053699 is 996350788171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996350788171 = 109 ⋅9140832919.

It is a cyclic number.

It is not a de Polignac number, because 171887053699 - 2⁹ = 171887053187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171887053699.

It is not an unprimeable number, because it can be changed into a prime (171887053799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627324877 + ... + 627325150.

It is an arithmetic number, because the mean of its divisors is an integer number (43285425966).

Almost surely, 2^171887053699 is an apocalyptic number.

171887053699 is a deficient number, since it is larger than the sum of its proper divisors (1254650165).

171887053699 is a wasteful number, since it uses less digits than its factorization.

171887053699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254650164.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 171887053699 in words is "one hundred seventy-one billion, eight hundred eighty-seven million, fifty-three thousand, six hundred ninety-nine".