1423065661 has 2 divisors, whose sum is σ = 1423065662. Its totient is φ = 1423065660.

The previous prime is 1423065619. The next prime is 1423065673. The reversal of 1423065661 is 1665603241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1036196100 + 386869561 = 32190^2 + 19669^2 .

It is an emirp because it is prime and its reverse (1665603241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1423065661 - 2⁷ = 1423065533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1423065601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711532830 + 711532831.

It is an arithmetic number, because the mean of its divisors is an integer number (711532831).

Almost surely, 2^1423065661 is an apocalyptic number.

It is an amenable number.

1423065661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423065661 is an equidigital number, since it uses as much as digits as its factorization.

1423065661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1423065661 is about 37723.5425298314. The cubic root of 1423065661 is about 1124.7991505801.

The spelling of 1423065661 in words is "one billion, four hundred twenty-three million, sixty-five thousand, six hundred sixty-one".