15311450018 has 18 divisors (see below), whose sum is σ = 23378811579. Its totient is φ = 7520892132.

The previous prime is 15311450003. The next prime is 15311450039. The reversal of 15311450018 is 81005411351.

It can be written as a sum of positive squares in only one way, i.e., 7655725009 + 7655725009 = 87497^2 + 87497^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=87497.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10323905 + ... + 10325387.

Almost surely, 2^15311450018 is an apocalyptic number.

15311450018 is a deficient number, since it is larger than the sum of its proper divisors (8067361561).

15311450018 is an frugal number, since it uses more digits than its factorization.

15311450018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 15311450018 its reverse (81005411351), we get a palindrome (96316861369).

The spelling of 15311450018 in words is "fifteen billion, three hundred eleven million, four hundred fifty thousand, eighteen".