161097435860 has 12 divisors (see below), whose sum is σ = 338304615348. Its totient is φ = 64438974336.

The previous prime is 161097435859. The next prime is 161097435883. The reversal of 161097435860 is 68534790161.

It can be written as a sum of positive squares in 2 ways, for example, as 16992165316 + 144105270544 = 130354^2 + 379612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161097435799 and 161097435808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4027435877 + ... + 4027435916.

It is an arithmetic number, because the mean of its divisors is an integer number (28192051279).

Almost surely, 2^161097435860 is an apocalyptic number.

161097435860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161097435860 is an abundant number, since it is smaller than the sum of its proper divisors (177207179488).

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

161097435860 is a wasteful number, since it uses less digits than its factorization.

161097435860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054871802 (or 8054871800 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 161097435860 in words is "one hundred sixty-one billion, ninety-seven million, four hundred thirty-five thousand, eight hundred sixty".