161224666789 has 4 divisors (see below), whose sum is σ = 163957288320. Its totient is φ = 158492045260.

The previous prime is 161224666787. The next prime is 161224666831. The reversal of 161224666789 is 987666422161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161224666789 - 2¹ = 161224666787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161224666787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366310677 + ... + 1366310794.

It is an arithmetic number, because the mean of its divisors is an integer number (40989322080).

Almost surely, 2^161224666789 is an apocalyptic number.

It is an amenable number.

161224666789 is a deficient number, since it is larger than the sum of its proper divisors (2732621531).

161224666789 is an equidigital number, since it uses as much as digits as its factorization.

161224666789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732621530.

The product of its digits is 10450944, while the sum is 58.

The spelling of 161224666789 in words is "one hundred sixty-one billion, two hundred twenty-four million, six hundred sixty-six thousand, seven hundred eighty-nine".