15172210145 has 4 divisors (see below), whose sum is σ = 18206652180. Its totient is φ = 12137768112.

The previous prime is 15172210139. The next prime is 15172210223. The reversal of 15172210145 is 54101227151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6962400481 + 8209809664 = 83441^2 + 90608^2 .

It is a cyclic number.

It is not a de Polignac number, because 15172210145 - 2⁴ = 15172210129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517221010 + ... + 1517221019.

It is an arithmetic number, because the mean of its divisors is an integer number (4551663045).

Almost surely, 2^15172210145 is an apocalyptic number.

It is an amenable number.

15172210145 is a deficient number, since it is larger than the sum of its proper divisors (3034442035).

15172210145 is an equidigital number, since it uses as much as digits as its factorization.

15172210145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034442034.

The product of its (nonzero) digits is 2800, while the sum is 29.

Adding to 15172210145 its reverse (54101227151), we get a palindrome (69273437296).

The spelling of 15172210145 in words is "fifteen billion, one hundred seventy-two million, two hundred ten thousand, one hundred forty-five".