15123215303 has 6 divisors (see below), whose sum is σ = 17592311736. Its totient is φ = 12962755932.

The previous prime is 15123215227. The next prime is 15123215329. The reversal of 15123215303 is 30351232151.

It is not a de Polignac number, because 15123215303 - 2¹⁰ = 15123214279 is a prime.

It is a super-2 number, since 2×15123215303² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15123215603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154318475 + ... + 154318572.

It is an arithmetic number, because the mean of its divisors is an integer number (2932051956).

Almost surely, 2^15123215303 is an apocalyptic number.

15123215303 is a deficient number, since it is larger than the sum of its proper divisors (2469096433).

15123215303 is an equidigital number, since it uses as much as digits as its factorization.

15123215303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308637061 (or 308637054 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 15123215303 its reverse (30351232151), we get a palindrome (45474447454).

The spelling of 15123215303 in words is "fifteen billion, one hundred twenty-three million, two hundred fifteen thousand, three hundred three".