161551611212012 has 36 divisors (see below), whose sum is σ = 328873794006240. Its totient is φ = 69236221398624.

The previous prime is 161551611211993. The next prime is 161551611212021. The reversal of 161551611212012 is 210212116155161.

It is a super-2 number, since 2×161551611212012² (a number of 29 digits) contains 22 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 11 ways as a sum of consecutive naturals, for example, 94293914 + ... + 95991902.

It is an arithmetic number, because the mean of its divisors is an integer number (9135383166840).

Almost surely, 2^{161551611212012} is an apocalyptic number.

It is an amenable number.

161551611212012 is an abundant number, since it is smaller than the sum of its proper divisors (167322182794228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161551611212012 is a wasteful number, since it uses less digits than its factorization.

161551611212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183430 (or 2183421 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 35.

Adding to 161551611212012 its reverse (210212116155161), we get a palindrome (371763727367173).

The spelling of 161551611212012 in words is "one hundred sixty-one trillion, five hundred fifty-one billion, six hundred eleven million, two hundred twelve thousand, twelve".