201670201871 has 4 divisors (see below), whose sum is σ = 204680204952. Its totient is φ = 198660198792.

The previous prime is 201670201849. The next prime is 201670201877. The reversal of 201670201871 is 178102076102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201670201871 - 2⁶ = 201670201807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201670201877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505001440 + ... + 1505001573.

It is an arithmetic number, because the mean of its divisors is an integer number (51170051238).

Almost surely, 2^201670201871 is an apocalyptic number.

201670201871 is a deficient number, since it is larger than the sum of its proper divisors (3010003081).

201670201871 is an equidigital number, since it uses as much as digits as its factorization.

201670201871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010003080.

The product of its (nonzero) digits is 9408, while the sum is 35.

Adding to 201670201871 its reverse (178102076102), we get a palindrome (379772277973).

The spelling of 201670201871 in words is "two hundred one billion, six hundred seventy million, two hundred one thousand, eight hundred seventy-one".