16162512661 has 2 divisors, whose sum is σ = 16162512662. Its totient is φ = 16162512660.

The previous prime is 16162512623. The next prime is 16162512719. The reversal of 16162512661 is 16621526161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14455252900 + 1707259761 = 120230^2 + 41319^2 .

It is a cyclic number.

It is not a de Polignac number, because 16162512661 - 2¹¹ = 16162510613 is a prime.

It is a super-2 number, since 2×16162512661² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16162512661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16162512601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8081256330 + 8081256331.

It is an arithmetic number, because the mean of its divisors is an integer number (8081256331).

Almost surely, 2^16162512661 is an apocalyptic number.

It is an amenable number.

16162512661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16162512661 is an equidigital number, since it uses as much as digits as its factorization.

16162512661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The spelling of 16162512661 in words is "sixteen billion, one hundred sixty-two million, five hundred twelve thousand, six hundred sixty-one".