19689613682 has 18 divisors (see below), whose sum is σ = 29722843143. Its totient is φ = 9782396832.

The previous prime is 19689613661. The next prime is 19689613687. The reversal of 19689613682 is 28631698691.

It can be written as a sum of positive squares in 5 ways, for example, as 3984260641 + 15705353041 = 63121^2 + 125321^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99221.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19689613687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 62112188 + ... + 62112504.

Almost surely, 2^19689613682 is an apocalyptic number.

19689613682 is a deficient number, since it is larger than the sum of its proper divisors (10033229461).

19689613682 is an frugal number, since it uses more digits than its factorization.

19689613682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262 (or 632 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 59.

The spelling of 19689613682 in words is "nineteen billion, six hundred eighty-nine million, six hundred thirteen thousand, six hundred eighty-two".