19439536646 has 16 divisors (see below), whose sum is σ = 29601490176. Its totient is φ = 9572441736.

The previous prime is 19439536639. The next prime is 19439536693. The reversal of 19439536646 is 64663593491.

It is a super-2 number, since 2×19439536646² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19439536591 and 19439536600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650975 + ... + 680181.

It is an arithmetic number, because the mean of its divisors is an integer number (1850093136).

Almost surely, 2^19439536646 is an apocalyptic number.

19439536646 is a deficient number, since it is larger than the sum of its proper divisors (10161953530).

19439536646 is a wasteful number, since it uses less digits than its factorization.

19439536646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34243.

The product of its digits is 12597120, while the sum is 56.

The spelling of 19439536646 in words is "nineteen billion, four hundred thirty-nine million, five hundred thirty-six thousand, six hundred forty-six".