15315721323 has 32 divisors (see below), whose sum is σ = 23822553600. Its totient is φ = 8571334656.

The previous prime is 15315721307. The next prime is 15315721357. The reversal of 15315721323 is 32312751351.

It is not a de Polignac number, because 15315721323 - 2⁴ = 15315721307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15315721823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310315 + ... + 356267.

It is an arithmetic number, because the mean of its divisors is an integer number (744454800).

Almost surely, 2^15315721323 is an apocalyptic number.

15315721323 is a deficient number, since it is larger than the sum of its proper divisors (8506832277).

15315721323 is a wasteful number, since it uses less digits than its factorization.

15315721323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46291.

The product of its digits is 18900, while the sum is 33.

The spelling of 15315721323 in words is "fifteen billion, three hundred fifteen million, seven hundred twenty-one thousand, three hundred twenty-three".