161645469120 has 168 divisors, whose sum is σ = 556927207200. Its totient is φ = 43033036800.

The previous prime is 161645469107. The next prime is 161645469121. The reversal of 161645469120 is 21964546161.

161645469120 is a `hidden beast` number, since 1 + 6 + 1 + 64 + 5 + 469 + 120 = 666.

It is a super-2 number, since 2×161645469120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161645469121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1678270 + ... + 1771970.

It is an arithmetic number, because the mean of its divisors is an integer number (3315042900).

Almost surely, 2^161645469120 is an apocalyptic number.

161645469120 is a gapful number since it is divisible by the number (10) 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 161645469120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278463603600).

161645469120 is an abundant number, since it is smaller than the sum of its proper divisors (395281738080).

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

161645469120 is a wasteful number, since it uses less digits than its factorization.

161645469120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94323 (or 94310 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 161645469120 in words is "one hundred sixty-one billion, six hundred forty-five million, four hundred sixty-nine thousand, one hundred twenty".