16405706423 has 2 divisors, whose sum is σ = 16405706424. Its totient is φ = 16405706422.

The previous prime is 16405706419. The next prime is 16405706453. The reversal of 16405706423 is 32460750461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16405706423 - 2² = 16405706419 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16405706453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8202853211 + 8202853212.

It is an arithmetic number, because the mean of its divisors is an integer number (8202853212).

Almost surely, 2^16405706423 is an apocalyptic number.

16405706423 is a deficient number, since it is larger than the sum of its proper divisors (1).

16405706423 is an equidigital number, since it uses as much as digits as its factorization.

16405706423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 16405706423 in words is "sixteen billion, four hundred five million, seven hundred six thousand, four hundred twenty-three".