201651667117 has 4 divisors (see below), whose sum is σ = 201655748320. Its totient is φ = 201647585916.

The previous prime is 201651667067. The next prime is 201651667169. The reversal of 201651667117 is 711766156102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 711766156102 = 2 ⋅355883078051.

It is a cyclic number.

It is not a de Polignac number, because 201651667117 - 2¹¹ = 201651665069 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 (201651667177) 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, 1965567 + ... + 2065612.

It is an arithmetic number, because the mean of its divisors is an integer number (50413937080).

Almost surely, 2^201651667117 is an apocalyptic number.

It is an amenable number.

201651667117 is a deficient number, since it is larger than the sum of its proper divisors (4081203).

201651667117 is an equidigital number, since it uses as much as digits as its factorization.

201651667117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081202.

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 201651667117 in words is "two hundred one billion, six hundred fifty-one million, six hundred sixty-seven thousand, one hundred seventeen".