19640101605 has 16 divisors (see below), whose sum is σ = 31650239040. Its totient is φ = 10399362048.

The previous prime is 19640101597. The next prime is 19640101631. The reversal of 19640101605 is 50610104691.

It is not a de Polignac number, because 19640101605 - 2³ = 19640101597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4707772 + ... + 4711941.

It is an arithmetic number, because the mean of its divisors is an integer number (1978139940).

Almost surely, 2^19640101605 is an apocalyptic number.

19640101605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19640101605 is a deficient number, since it is larger than the sum of its proper divisors (12010137435).

19640101605 is a wasteful number, since it uses less digits than its factorization.

19640101605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9419860.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 19640101605 in words is "nineteen billion, six hundred forty million, one hundred one thousand, six hundred five".