15125315215 has 4 divisors (see below), whose sum is σ = 18150378264. Its totient is φ = 12100252168.

The previous prime is 15125315209. The next prime is 15125315281. The reversal of 15125315215 is 51251352151.

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

It is a cyclic number.

It is not a de Polignac number, because 15125315215 - 2⁷ = 15125315087 is a prime.

It is a super-2 number, since 2×15125315215² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 1512531517 + ... + 1512531526.

It is an arithmetic number, because the mean of its divisors is an integer number (4537594566).

Almost surely, 2^15125315215 is an apocalyptic number.

15125315215 is a deficient number, since it is larger than the sum of its proper divisors (3025063049).

15125315215 is an equidigital number, since it uses as much as digits as its factorization.

15125315215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025063048.

The product of its digits is 7500, while the sum is 31.

Adding to 15125315215 its reverse (51251352151), we get a palindrome (66376667366).

The spelling of 15125315215 in words is "fifteen billion, one hundred twenty-five million, three hundred fifteen thousand, two hundred fifteen".