171223740516261 has 16 divisors (see below), whose sum is σ = 231191534280960. Its totient is φ = 112702595566080.

The previous prime is 171223740516259. The next prime is 171223740516271. The reversal of 171223740516261 is 162615047322171.

It is a happy number.

171223740516261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 171223740516261 - 2¹ = 171223740516259 is a prime.

It is a super-4 number, since 4×171223740516261⁴ (a number of 58 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 171223740516261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171223740516271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11190601 + ... + 21625841.

It is an arithmetic number, because the mean of its divisors is an integer number (14449470892560).

Almost surely, 2^{171223740516261} is an apocalyptic number.

It is an amenable number.

171223740516261 is a deficient number, since it is larger than the sum of its proper divisors (59967793764699).

171223740516261 is a wasteful number, since it uses less digits than its factorization.

171223740516261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10504556.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 171223740516261 in words is "one hundred seventy-one trillion, two hundred twenty-three billion, seven hundred forty million, five hundred sixteen thousand, two hundred sixty-one".