161818383456 has 72 divisors (see below), whose sum is σ = 484390572120. Its totient is φ = 51100540416.

The previous prime is 161818383449. The next prime is 161818383469. The reversal of 161818383456 is 654383818161.

It is a happy number.

161818383456 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 183 + 8 + 3 + 456 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

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, 14780565 + ... + 14791508.

It is an arithmetic number, because the mean of its divisors is an integer number (6727646835).

Almost surely, 2^161818383456 is an apocalyptic number.

161818383456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161818383456 is an abundant number, since it is smaller than the sum of its proper divisors (322572188664).

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

161818383456 is a wasteful number, since it uses less digits than its factorization.

161818383456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29572108 (or 29572097 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 161818383456 in words is "one hundred sixty-one billion, eight hundred eighteen million, three hundred eighty-three thousand, four hundred fifty-six".