15000000123 has 8 divisors (see below), whose sum is σ = 20076046848. Its totient is φ = 9961976744.

The previous prime is 15000000089. The next prime is 15000000131. The reversal of 15000000123 is 32100000051.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15000000123 - 2⁸ = 14999999867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15000000099 and 15000000108.

It is not an unprimeable number, because it can be changed into a prime (15007000123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9504915 + ... + 9506492.

It is an arithmetic number, because the mean of its divisors is an integer number (2509505856).

Almost surely, 2^15000000123 is an apocalyptic number.

15000000123 is a deficient number, since it is larger than the sum of its proper divisors (5076046725).

15000000123 is a wasteful number, since it uses less digits than its factorization.

15000000123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19011673.

The product of its (nonzero) digits is 30, while the sum is 12.

Adding to 15000000123 its reverse (32100000051), we get a palindrome (47100000174).

The spelling of 15000000123 in words is "fifteen billion, one hundred twenty-three", and thus it is an aban number.