15172156117 has 2 divisors, whose sum is σ = 15172156118. Its totient is φ = 15172156116.

The previous prime is 15172156049. The next prime is 15172156147. The reversal of 15172156117 is 71165127151.

It is a happy number.

15172156117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11528102161 + 3644053956 = 107369^2 + 60366^2 .

It is a cyclic number.

It is not a de Polignac number, because 15172156117 - 2⁷ = 15172155989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15172156147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7586078058 + 7586078059.

It is an arithmetic number, because the mean of its divisors is an integer number (7586078059).

Almost surely, 2^15172156117 is an apocalyptic number.

It is an amenable number.

15172156117 is a deficient number, since it is larger than the sum of its proper divisors (1).

15172156117 is an equidigital number, since it uses as much as digits as its factorization.

15172156117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 37.

The spelling of 15172156117 in words is "fifteen billion, one hundred seventy-two million, one hundred fifty-six thousand, one hundred seventeen".