16878497731181 has 2 divisors, whose sum is σ = 16878497731182. Its totient is φ = 16878497731180.

The previous prime is 16878497731171. The next prime is 16878497731201. The reversal of 16878497731181 is 18113779487861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12133615755556 + 4744881975625 = 3483334^2 + 2178275^2 .

It is a cyclic number.

It is not a de Polignac number, because 16878497731181 - 2⁴² = 12480451220077 is a prime.

It is a super-2 number, since 2×16878497731181² (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 (16878497731171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8439248865590 + 8439248865591.

It is an arithmetic number, because the mean of its divisors is an integer number (8439248865591).

Almost surely, 2^{16878497731181} is an apocalyptic number.

It is an amenable number.

16878497731181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16878497731181 is an equidigital number, since it uses as much as digits as its factorization.

16878497731181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113799168, while the sum is 71.

The spelling of 16878497731181 in words is "sixteen trillion, eight hundred seventy-eight billion, four hundred ninety-seven million, seven hundred thirty-one thousand, one hundred eighty-one".