161541415443 has 24 divisors (see below), whose sum is σ = 221927251968. Its totient is φ = 104516872000.

The previous prime is 161541415439. The next prime is 161541415543. The reversal of 161541415443 is 344514145161.

It is not a de Polignac number, because 161541415443 - 2² = 161541415439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161541415543) 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, 879358 + ... + 1047068.

It is an arithmetic number, because the mean of its divisors is an integer number (9246968832).

Almost surely, 2^161541415443 is an apocalyptic number.

161541415443 is a deficient number, since it is larger than the sum of its proper divisors (60385836525).

161541415443 is a wasteful number, since it uses less digits than its factorization.

161541415443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167987 (or 167946 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The spelling of 161541415443 in words is "one hundred sixty-one billion, five hundred forty-one million, four hundred fifteen thousand, four hundred forty-three".