16174618981 has 2 divisors, whose sum is σ = 16174618982. Its totient is φ = 16174618980.

The previous prime is 16174618913. The next prime is 16174619051. The reversal of 16174618981 is 18981647161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10752653025 + 5421965956 = 103695^2 + 73634^2 .

It is a cyclic number.

It is not a de Polignac number, because 16174618981 - 2¹⁵ = 16174586213 is a prime.

It is a super-2 number, since 2×16174618981² (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 (16174618381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8087309490 + 8087309491.

It is an arithmetic number, because the mean of its divisors is an integer number (8087309491).

Almost surely, 2^16174618981 is an apocalyptic number.

It is an amenable number.

16174618981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16174618981 is an equidigital number, since it uses as much as digits as its factorization.

16174618981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 52.

The spelling of 16174618981 in words is "sixteen billion, one hundred seventy-four million, six hundred eighteen thousand, nine hundred eighty-one".