161873301730 has 48 divisors (see below), whose sum is σ = 339013936440. Its totient is φ = 55487781888.

The previous prime is 161873301719. The next prime is 161873301731. The reversal of 161873301730 is 37103378161.

It can be written as a sum of positive squares in 4 ways, for example, as 161561390809 + 311910921 = 401947^2 + 17661^2 .

It is not an unprimeable number, because it can be changed into a prime (161873301731) 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, 2492916 + ... + 2557024.

Almost surely, 2^161873301730 is an apocalyptic number.

161873301730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161873301730 is an abundant number, since it is smaller than the sum of its proper divisors (177140634710).

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

161873301730 is a wasteful number, since it uses less digits than its factorization.

161873301730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69283 (or 69276 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

Adding to 161873301730 its reverse (37103378161), we get a palindrome (198976679891).

The spelling of 161873301730 in words is "one hundred sixty-one billion, eight hundred seventy-three million, three hundred one thousand, seven hundred thirty".