165143644631623 has 16 divisors (see below), whose sum is σ = 195112652454720. Its totient is φ = 136832249721600.

The previous prime is 165143644631597. The next prime is 165143644631663. The reversal of 165143644631623 is 326136446341561.

It is a cyclic number.

It is not a de Polignac number, because 165143644631623 - 2⁵ = 165143644631591 is a prime.

It is a super-2 number, since 2×165143644631623² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165143644631663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2639479708 + ... + 2639542273.

It is an arithmetic number, because the mean of its divisors is an integer number (12194540778420).

Almost surely, 2^{165143644631623} is an apocalyptic number.

165143644631623 is a deficient number, since it is larger than the sum of its proper divisors (29969007823097).

165143644631623 is a wasteful number, since it uses less digits than its factorization.

165143644631623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279022138.

The product of its digits is 22394880, while the sum is 55.

The spelling of 165143644631623 in words is "one hundred sixty-five trillion, one hundred forty-three billion, six hundred forty-four million, six hundred thirty-one thousand, six hundred twenty-three".