19812654644 has 24 divisors (see below), whose sum is σ = 35156253888. Its totient is φ = 9768081600.

The previous prime is 19812654611. The next prime is 19812654671. The reversal of 19812654644 is 44645621891.

It is a super-3 number, since 3×19812654644³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19812654592 and 19812654601.

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, 1644089 + ... + 1656095.

It is an arithmetic number, because the mean of its divisors is an integer number (1464843912).

Almost surely, 2^19812654644 is an apocalyptic number.

It is an amenable number.

19812654644 is a deficient number, since it is larger than the sum of its proper divisors (15343599244).

19812654644 is a wasteful number, since it uses less digits than its factorization.

19812654644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17735 (or 17733 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 50.

The spelling of 19812654644 in words is "nineteen billion, eight hundred twelve million, six hundred fifty-four thousand, six hundred forty-four".