19868506647 has 32 divisors (see below), whose sum is σ = 29145360384. Its totient is φ = 11939580000.

The previous prime is 19868506621. The next prime is 19868506673. The reversal of 19868506647 is 74660586891.

It is an interprime number because it is at equal distance from previous prime (19868506621) and next prime (19868506673).

It is not a de Polignac number, because 19868506647 - 2¹⁴ = 19868490263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19868506447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1874958 + ... + 1885524.

It is an arithmetic number, because the mean of its divisors is an integer number (910792512).

Almost surely, 2^19868506647 is an apocalyptic number.

19868506647 is a deficient number, since it is larger than the sum of its proper divisors (9276853737).

19868506647 is a wasteful number, since it uses less digits than its factorization.

19868506647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11059.

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 19868506647 in words is "nineteen billion, eight hundred sixty-eight million, five hundred six thousand, six hundred forty-seven".