16161111511 has 2 divisors, whose sum is σ = 16161111512. Its totient is φ = 16161111510.

The previous prime is 16161111493. The next prime is 16161111553. The reversal of 16161111511 is 11511116161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16161111511 - 2⁷ = 16161111383 is a prime.

It is a super-2 number, since 2×16161111511² (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 (16161111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8080555755 + 8080555756.

It is an arithmetic number, because the mean of its divisors is an integer number (8080555756).

Almost surely, 2^16161111511 is an apocalyptic number.

16161111511 is a deficient number, since it is larger than the sum of its proper divisors (1).

16161111511 is an equidigital number, since it uses as much as digits as its factorization.

16161111511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 25.

Adding to 16161111511 its reverse (11511116161), we get a palindrome (27672227672).

The spelling of 16161111511 in words is "sixteen billion, one hundred sixty-one million, one hundred eleven thousand, five hundred eleven".