16427667181 has 2 divisors, whose sum is σ = 16427667182. Its totient is φ = 16427667180.

The previous prime is 16427667173. The next prime is 16427667203. The reversal of 16427667181 is 18176672461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15347493225 + 1080173956 = 123885^2 + 32866^2 .

It is a cyclic number.

It is not a de Polignac number, because 16427667181 - 2³ = 16427667173 is a prime.

It is a super-2 number, since 2×16427667181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16427667101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8213833590 + 8213833591.

It is an arithmetic number, because the mean of its divisors is an integer number (8213833591).

Almost surely, 2^16427667181 is an apocalyptic number.

It is an amenable number.

16427667181 is a deficient number, since it is larger than the sum of its proper divisors (1).

16427667181 is an equidigital number, since it uses as much as digits as its factorization.

16427667181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The spelling of 16427667181 in words is "sixteen billion, four hundred twenty-seven million, six hundred sixty-seven thousand, one hundred eighty-one".