161780451831042 has 64 divisors (see below), whose sum is σ = 364380586200576. Its totient is φ = 47460522735360.

The previous prime is 161780451831041. The next prime is 161780451831067. The reversal of 161780451831042 is 240138154087161.

It is a super-2 number, since 2×161780451831042² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161780451831041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251914228 + ... + 252555615.

It is an arithmetic number, because the mean of its divisors is an integer number (5693446659384).

Almost surely, 2^{161780451831042} is an apocalyptic number.

161780451831042 is an abundant number, since it is smaller than the sum of its proper divisors (202600134369534).

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

161780451831042 is a wasteful number, since it uses less digits than its factorization.

161780451831042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504470015.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 161780451831042 in words is "one hundred sixty-one trillion, seven hundred eighty billion, four hundred fifty-one million, eight hundred thirty-one thousand, forty-two".