161816653212 has 24 divisors (see below), whose sum is σ = 377726938512. Its totient is φ = 53916777600.

The previous prime is 161816653211. The next prime is 161816653223. The reversal of 161816653212 is 212356618161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161816653211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732839 + ... + 2791422.

It is an arithmetic number, because the mean of its divisors is an integer number (15738622438).

Almost surely, 2^161816653212 is an apocalyptic number.

161816653212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161816653212 is an abundant number, since it is smaller than the sum of its proper divisors (215910285300).

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

161816653212 is a wasteful number, since it uses less digits than its factorization.

161816653212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526709 (or 5526707 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The spelling of 161816653212 in words is "one hundred sixty-one billion, eight hundred sixteen million, six hundred fifty-three thousand, two hundred twelve".