219980161836 has 36 divisors (see below), whose sum is σ = 558972296064. Its totient is φ = 72942808800.

The previous prime is 219980161801. The next prime is 219980161847. The reversal of 219980161836 is 638161089912.

219980161836 is a `hidden beast` number, since 2 + 19 + 9 + 8 + 0 + 1 + 618 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15989355 + ... + 16003106.

It is an arithmetic number, because the mean of its divisors is an integer number (15527008224).

Almost surely, 2^219980161836 is an apocalyptic number.

It is an amenable number.

219980161836 is an abundant number, since it is smaller than the sum of its proper divisors (338992134228).

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

219980161836 is a wasteful number, since it uses less digits than its factorization.

219980161836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31992662 (or 31992657 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 219980161836 in words is "two hundred nineteen billion, nine hundred eighty million, one hundred sixty-one thousand, eight hundred thirty-six".