161616150051561 has 16 divisors (see below), whose sum is σ = 239443499805120. Its totient is φ = 107738625156480.

The previous prime is 161616150051529. The next prime is 161616150051569. The reversal of 161616150051561 is 165150051616161.

161616150051561 is a `hidden beast` number, since 1 + 6 + 1 + 61 + 6 + 15 + 0 + 0 + 515 + 61 = 666.

It is not a de Polignac number, because 161616150051561 - 2⁵ = 161616150051529 is a prime.

It is a super-2 number, since 2×161616150051561² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161616150051569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151538715 + ... + 152601488.

It is an arithmetic number, because the mean of its divisors is an integer number (14965218737820).

Almost surely, 2^{161616150051561} is an apocalyptic number.

It is an amenable number.

161616150051561 is a deficient number, since it is larger than the sum of its proper divisors (77827349753559).

161616150051561 is a wasteful number, since it uses less digits than its factorization.

161616150051561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304159893 (or 304159887 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 45.

The spelling of 161616150051561 in words is "one hundred sixty-one trillion, six hundred sixteen billion, one hundred fifty million, fifty-one thousand, five hundred sixty-one".