19644606423 has 48 divisors (see below), whose sum is σ = 30961170240. Its totient is φ = 11930499072.

The previous prime is 19644606419. The next prime is 19644606439. The reversal of 19644606423 is 32460644691.

19644606423 is a `hidden beast` number, since 19 + 6 + 4 + 4 + 606 + 4 + 23 = 666.

It is not a de Polignac number, because 19644606423 - 2² = 19644606419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19644606493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3351111 + ... + 3356967.

It is an arithmetic number, because the mean of its divisors is an integer number (645024380).

Almost surely, 2^19644606423 is an apocalyptic number.

19644606423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19644606423 is a deficient number, since it is larger than the sum of its proper divisors (11316563817).

19644606423 is a wasteful number, since it uses less digits than its factorization.

19644606423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248 (or 6245 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 19644606423 in words is "nineteen billion, six hundred forty-four million, six hundred six thousand, four hundred twenty-three".