161901108443 has 8 divisors (see below), whose sum is σ = 166209696576. Its totient is φ = 157609652800.

The previous prime is 161901108437. The next prime is 161901108461. The reversal of 161901108443 is 344801109161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161901108443 - 2³⁶ = 93181631707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161901108397 and 161901108406.

It is not an unprimeable number, because it can be changed into a prime (161901101443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4263971 + ... + 4301772.

It is an arithmetic number, because the mean of its divisors is an integer number (20776212072).

Almost surely, 2^161901108443 is an apocalyptic number.

161901108443 is a deficient number, since it is larger than the sum of its proper divisors (4308588133).

161901108443 is an equidigital number, since it uses as much as digits as its factorization.

161901108443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566245.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 161901108443 in words is "one hundred sixty-one billion, nine hundred one million, one hundred eight thousand, four hundred forty-three".