15115021345 has 4 divisors (see below), whose sum is σ = 18138025620. Its totient is φ = 12092017072.

The previous prime is 15115021333. The next prime is 15115021373. The reversal of 15115021345 is 54312051151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54312051151 = 43 ⋅1263070957.

It can be written as a sum of positive squares in 2 ways, for example, as 7102444176 + 8012577169 = 84276^2 + 89513^2 .

It is a cyclic number.

It is not a de Polignac number, because 15115021345 - 2²⁵ = 15081466913 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, 1511502130 + ... + 1511502139.

It is an arithmetic number, because the mean of its divisors is an integer number (4534506405).

Almost surely, 2^15115021345 is an apocalyptic number.

It is an amenable number.

15115021345 is a deficient number, since it is larger than the sum of its proper divisors (3023004275).

15115021345 is an equidigital number, since it uses as much as digits as its factorization.

15115021345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3023004274.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 15115021345 its reverse (54312051151), we get a palindrome (69427072496).

The spelling of 15115021345 in words is "fifteen billion, one hundred fifteen million, twenty-one thousand, three hundred forty-five".