161845266044 has 72 divisors (see below), whose sum is σ = 354981207168. Its totient is φ = 62725432320.

The previous prime is 161845266013. The next prime is 161845266067. The reversal of 161845266044 is 440662548161.

It is a self number, because there is not a number n which added to its sum of digits gives 161845266044.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11465639 + ... + 11479745.

It is an arithmetic number, because the mean of its divisors is an integer number (4930294544).

Almost surely, 2^161845266044 is an apocalyptic number.

161845266044 is a gapful number since it is divisible by the number (14) 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 161845266044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177490603584).

161845266044 is an abundant number, since it is smaller than the sum of its proper divisors (193135941124).

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

161845266044 is a wasteful number, since it uses less digits than its factorization.

161845266044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14515 (or 14320 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 161845266044 in words is "one hundred sixty-one billion, eight hundred forty-five million, two hundred sixty-six thousand, forty-four".