161661147219 has 192 divisors, whose sum is σ = 292581273600. Its totient is φ = 87585442560.

The previous prime is 161661147217. The next prime is 161661147239. The reversal of 161661147219 is 912741166161.

It is a happy number.

161661147219 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 611 + 4 + 7 + 21 + 9 = 666.

It is not a de Polignac number, because 161661147219 - 2¹ = 161661147217 is a prime.

It is a super-2 number, since 2×161661147219² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161661147211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 217578562 + ... + 217579304.

It is an arithmetic number, because the mean of its divisors is an integer number (1523860800).

Almost surely, 2^161661147219 is an apocalyptic number.

161661147219 is a deficient number, since it is larger than the sum of its proper divisors (130920126381).

161661147219 is a wasteful number, since it uses less digits than its factorization.

161661147219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 926 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The spelling of 161661147219 in words is "one hundred sixty-one billion, six hundred sixty-one million, one hundred forty-seven thousand, two hundred nineteen".