19647729995776 has 39 divisors (see below), whose sum is σ = 39291230491131. Its totient is φ = 9823723155456.

The previous prime is 19647729995711. The next prime is 19647729995917. The reversal of 19647729995776 is 67759992774691.

It is a happy number.

The square root of 19647729995776 is 4432576.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 283650235 + ... + 283719493.

Almost surely, 2^{19647729995776} is an apocalyptic number.

19647729995776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19647729995776 is the 4432576-th square number.

It is an amenable number.

19647729995776 is a deficient number, since it is larger than the sum of its proper divisors (19643500495355).

19647729995776 is an frugal number, since it uses more digits than its factorization.

19647729995776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138542 (or 69261 counting only the distinct ones).

The product of its digits is 22684263840, while the sum is 88.

The spelling of 19647729995776 in words is "nineteen trillion, six hundred forty-seven billion, seven hundred twenty-nine million, nine hundred ninety-five thousand, seven hundred seventy-six".