161783505750 has 128 divisors (see below), whose sum is σ = 413657487360. Its totient is φ = 42095961600.

The previous prime is 161783505749. The next prime is 161783505757. The reversal of 161783505750 is 57505387161.

It is a self number, because there is not a number n which added to its sum of digits gives 161783505750.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161783505757) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11872441 + ... + 11886059.

It is an arithmetic number, because the mean of its divisors is an integer number (3231699120).

Almost surely, 2^161783505750 is an apocalyptic number.

161783505750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161783505750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206828743680).

161783505750 is an abundant number, since it is smaller than the sum of its proper divisors (251873981610).

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

161783505750 is a wasteful number, since it uses less digits than its factorization.

161783505750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14023 (or 14013 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 48.

The spelling of 161783505750 in words is "one hundred sixty-one billion, seven hundred eighty-three million, five hundred five thousand, seven hundred fifty".