16161616161 has 24 divisors (see below), whose sum is σ = 24440532480. Its totient is φ = 10277529696.

The previous prime is 16161616153. The next prime is 16161616181.

16161616161 is a `hidden beast` number, since 1 + 616 + 16 + 16 + 16 + 1 = 666.

16161616161 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16161616161 - 2³ = 16161616153 is a prime.

It is a super-2 number, since 2×16161616161² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

16161616161 is an undulating number in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16161616181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351361 + ... + 394686.

It is an arithmetic number, because the mean of its divisors is an integer number (1018355520).

Almost surely, 2^16161616161 is an apocalyptic number.

It is an amenable number.

16161616161 is a deficient number, since it is larger than the sum of its proper divisors (8278916319).

16161616161 is a wasteful number, since it uses less digits than its factorization.

16161616161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746165 (or 746162 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The spelling of 16161616161 in words is "sixteen billion, one hundred sixty-one million, six hundred sixteen thousand, one hundred sixty-one".