19636868647 has 8 divisors (see below), whose sum is σ = 21540394512. Its totient is φ = 17753068800.

The previous prime is 19636868639. The next prime is 19636868653. The reversal of 19636868647 is 74686863691.

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 19636868647 - 2³ = 19636868639 is a prime.

It is a super-2 number, since 2×19636868647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19636868617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4929418 + ... + 4933399.

It is an arithmetic number, because the mean of its divisors is an integer number (2692549314).

Almost surely, 2^19636868647 is an apocalyptic number.

19636868647 is a deficient number, since it is larger than the sum of its proper divisors (1903525865).

19636868647 is a wasteful number, since it uses less digits than its factorization.

19636868647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9863009.

The product of its digits is 62705664, while the sum is 64.

The spelling of 19636868647 in words is "nineteen billion, six hundred thirty-six million, eight hundred sixty-eight thousand, six hundred forty-seven".