161206561212 has 24 divisors (see below), whose sum is σ = 388282470912. Its totient is φ = 52002116400.

The previous prime is 161206561189. The next prime is 161206561261. The reversal of 161206561212 is 212165602161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216675114 + ... + 216675857.

It is an arithmetic number, because the mean of its divisors is an integer number (16178436288).

Almost surely, 2^161206561212 is an apocalyptic number.

161206561212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161206561212 is an abundant number, since it is smaller than the sum of its proper divisors (227075909700).

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

161206561212 is a wasteful number, since it uses less digits than its factorization.

161206561212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433351009 (or 433351007 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 161206561212 in words is "one hundred sixty-one billion, two hundred six million, five hundred sixty-one thousand, two hundred twelve".