161664288612 has 96 divisors (see below), whose sum is σ = 412626493440. Its totient is φ = 49042076160.

The previous prime is 161664288547. The next prime is 161664288631. The reversal of 161664288612 is 216882466161.

161664288612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161664288612² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

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 31 ways as a sum of consecutive naturals, for example, 8255689 + ... + 8275247.

It is an arithmetic number, because the mean of its divisors is an integer number (4298192640).

Almost surely, 2^161664288612 is an apocalyptic number.

161664288612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161664288612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206313246720).

161664288612 is an abundant number, since it is smaller than the sum of its proper divisors (250962204828).

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

161664288612 is a wasteful number, since it uses less digits than its factorization.

161664288612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20921 (or 20919 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The spelling of 161664288612 in words is "one hundred sixty-one billion, six hundred sixty-four million, two hundred eighty-eight thousand, six hundred twelve".