145222021165 has 8 divisors (see below), whose sum is σ = 187671535128. Its totient is φ = 107240877120.

The previous prime is 145222021123. The next prime is 145222021169. The reversal of 145222021165 is 561120222541.

It can be written as a sum of positive squares in 4 ways, for example, as 2910494601 + 142311526564 = 53949^2 + 377242^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145222021165 - 2⁹ = 145222020653 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 (145222021169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1117092406 + ... + 1117092535.

It is an arithmetic number, because the mean of its divisors is an integer number (23458941891).

Almost surely, 2^145222021165 is an apocalyptic number.

It is an amenable number.

145222021165 is a deficient number, since it is larger than the sum of its proper divisors (42449513963).

145222021165 is a wasteful number, since it uses less digits than its factorization.

145222021165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234184959.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 145222021165 in words is "one hundred forty-five billion, two hundred twenty-two million, twenty-one thousand, one hundred sixty-five".