19685009899 has 8 divisors (see below), whose sum is σ = 19826488880. Its totient is φ = 19544025600.

The previous prime is 19685009863. The next prime is 19685009917. The reversal of 19685009899 is 99890058691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19685009899 - 2²³ = 19676621291 is a prime.

It is a super-2 number, since 2×19685009899² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19685009899.

It is not an unprimeable number, because it can be changed into a prime (19685009809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43614 + ... + 203155.

It is an arithmetic number, because the mean of its divisors is an integer number (2478311110).

Almost surely, 2^19685009899 is an apocalyptic number.

19685009899 is a deficient number, since it is larger than the sum of its proper divisors (141478981).

19685009899 is a wasteful number, since it uses less digits than its factorization.

19685009899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247341.

The product of its (nonzero) digits is 12597120, while the sum is 64.

The spelling of 19685009899 in words is "nineteen billion, six hundred eighty-five million, nine thousand, eight hundred ninety-nine".