15145204717 has 4 divisors (see below), whose sum is σ = 15514599996. Its totient is φ = 14775809440.

The previous prime is 15145204667. The next prime is 15145204729. The reversal of 15145204717 is 71740254151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71740254151 = 229 ⋅313276219.

It can be written as a sum of positive squares in 2 ways, for example, as 1466966601 + 13678238116 = 38301^2 + 116954^2 .

It is a cyclic number.

It is not a de Polignac number, because 15145204717 - 2¹¹ = 15145202669 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 (15145204757) 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, 184697578 + ... + 184697659.

It is an arithmetic number, because the mean of its divisors is an integer number (3878649999).

Almost surely, 2^15145204717 is an apocalyptic number.

It is an amenable number.

15145204717 is a deficient number, since it is larger than the sum of its proper divisors (369395279).

15145204717 is an equidigital number, since it uses as much as digits as its factorization.

15145204717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369395278.

The product of its (nonzero) digits is 39200, while the sum is 37.

Adding to 15145204717 its reverse (71740254151), we get a palindrome (86885458868).

The spelling of 15145204717 in words is "fifteen billion, one hundred forty-five million, two hundred four thousand, seven hundred seventeen".