15123681816 has 16 divisors (see below), whose sum is σ = 37809204600. Its totient is φ = 5041227264.

The previous prime is 15123681791. The next prime is 15123681821. The reversal of 15123681816 is 61818632151.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315076681 + ... + 315076728.

Almost surely, 2^15123681816 is an apocalyptic number.

It is an amenable number.

15123681816 is an abundant number, since it is smaller than the sum of its proper divisors (22685522784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15123681816 is a wasteful number, since it uses less digits than its factorization.

15123681816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630153418 (or 630153414 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The spelling of 15123681816 in words is "fifteen billion, one hundred twenty-three million, six hundred eighty-one thousand, eight hundred sixteen".