15791181475117 has 2 divisors, whose sum is σ = 15791181475118. Its totient is φ = 15791181475116.

The previous prime is 15791181475081. The next prime is 15791181475207. The reversal of 15791181475117 is 71157418119751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9102807931396 + 6688373543721 = 3017086^2 + 2586189^2 .

It is a cyclic number.

It is not a de Polignac number, because 15791181475117 - 2³¹ = 15789033991469 is a prime.

It is a super-2 number, since 2×15791181475117² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15791181470117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7895590737558 + 7895590737559.

It is an arithmetic number, because the mean of its divisors is an integer number (7895590737559).

Almost surely, 2^{15791181475117} is an apocalyptic number.

It is an amenable number.

15791181475117 is a deficient number, since it is larger than the sum of its proper divisors (1).

15791181475117 is an equidigital number, since it uses as much as digits as its factorization.

15791181475117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469600, while the sum is 58.

The spelling of 15791181475117 in words is "fifteen trillion, seven hundred ninety-one billion, one hundred eighty-one million, four hundred seventy-five thousand, one hundred seventeen".