161842931545680 has 4800 divisors, whose sum is σ = 781715064176640. Its totient is φ = 30569011200000.

The previous prime is 161842931545613. The next prime is 161842931545681. The reversal of 161842931545680 is 86545139248161.

It is a happy number.

161842931545680 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 4 + 2 + 9 + 3 + 1 + 545 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161842931545681) by changing a digit.

It is a polite number, since it can be written in 959 ways as a sum of consecutive naturals, for example, 310639023820 + ... + 310639024340.

Almost surely, 2^{161842931545680} is an apocalyptic number.

161842931545680 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 161842931545680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390857532088320).

161842931545680 is an abundant number, since it is smaller than the sum of its proper divisors (619872132630960).

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

161842931545680 is a wasteful number, since it uses less digits than its factorization.

161842931545680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 161842931545680 in words is "one hundred sixty-one trillion, eight hundred forty-two billion, nine hundred thirty-one million, five hundred forty-five thousand, six hundred eighty".