165106631021231 has 4 divisors (see below), whose sum is σ = 168946320114792. Its totient is φ = 161266941927672.

The previous prime is 165106631021107. The next prime is 165106631021237. The reversal of 165106631021231 is 132120136601561.

165106631021231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 165106631021231 - 2⁴² = 160708584510127 is a prime.

It is a super-2 number, since 2×165106631021231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165106631021237) 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, 1919844546716 + ... + 1919844546801.

It is an arithmetic number, because the mean of its divisors is an integer number (42236580028698).

Almost surely, 2^{165106631021231} is an apocalyptic number.

165106631021231 is a deficient number, since it is larger than the sum of its proper divisors (3839689093561).

165106631021231 is an equidigital number, since it uses as much as digits as its factorization.

165106631021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839689093560.

The product of its (nonzero) digits is 38880, while the sum is 38.

Adding to 165106631021231 its reverse (132120136601561), we get a palindrome (297226767622792).

The spelling of 165106631021231 in words is "one hundred sixty-five trillion, one hundred six billion, six hundred thirty-one million, twenty-one thousand, two hundred thirty-one".