161634622452 has 12 divisors (see below), whose sum is σ = 377147452416. Its totient is φ = 53878207480.

The previous prime is 161634622399. The next prime is 161634622489. The reversal of 161634622452 is 254226436161.

It is a happy number.

161634622452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×161634622452² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6734775924 + ... + 6734775947.

It is an arithmetic number, because the mean of its divisors is an integer number (31428954368).

Almost surely, 2^161634622452 is an apocalyptic number.

161634622452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161634622452 is an abundant number, since it is smaller than the sum of its proper divisors (215512829964).

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

161634622452 is a wasteful number, since it uses less digits than its factorization.

161634622452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13469551878 (or 13469551876 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The spelling of 161634622452 in words is "one hundred sixty-one billion, six hundred thirty-four million, six hundred twenty-two thousand, four hundred fifty-two".