161866134986 has 8 divisors (see below), whose sum is σ = 243841259844. Its totient is φ = 80585715040.

The previous prime is 161866134979. The next prime is 161866135031. The reversal of 161866134986 is 689431668161.

It can be written as a sum of positive squares in 2 ways, for example, as 126508973761 + 35357161225 = 355681^2 + 188035^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×161866134986³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173675645 + ... + 173676576.

Almost surely, 2^161866134986 is an apocalyptic number.

161866134986 is a deficient number, since it is larger than the sum of its proper divisors (81975124858).

161866134986 is a wasteful number, since it uses less digits than its factorization.

161866134986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347352456.

The product of its digits is 8957952, while the sum is 59.

The spelling of 161866134986 in words is "one hundred sixty-one billion, eight hundred sixty-six million, one hundred thirty-four thousand, nine hundred eighty-six".