1661211422423 has 12 divisors (see below), whose sum is σ = 1932484550040. Its totient is φ = 1423855025712.

The previous prime is 1661211422419. The next prime is 1661211422461. The reversal of 1661211422423 is 3242241121661.

It is a happy number.

It is not a de Polignac number, because 1661211422423 - 2² = 1661211422419 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 (1661211421423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1327973 + ... + 2255201.

It is an arithmetic number, because the mean of its divisors is an integer number (161040379170).

Almost surely, 2^{1661211422423} is an apocalyptic number.

1661211422423 is a deficient number, since it is larger than the sum of its proper divisors (271273127617).

1661211422423 is an equidigital number, since it uses as much as digits as its factorization.

1661211422423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963806 (or 963799 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The spelling of 1661211422423 in words is "one trillion, six hundred sixty-one billion, two hundred eleven million, four hundred twenty-two thousand, four hundred twenty-three".