19929670918756 has 9 divisors (see below), whose sum is σ = 34876939732761. Its totient is φ = 9964830995112.

The previous prime is 19929670918741. The next prime is 19929670918777. The reversal of 19929670918756 is 65781907692991.

The square root of 19929670918756 is 4464266.

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

It can be written as a sum of positive squares in only one way, i.e., 11244956222500 + 8684714696256 = 3353350^2 + 2946984^2 .

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, 7812466 + ... + 10044598.

Almost surely, 2^{19929670918756} is an apocalyptic number.

19929670918756 is the 4464266-th square number.

It is an amenable number.

19929670918756 is a deficient number, since it is larger than the sum of its proper divisors (14947268814005).

19929670918756 is an frugal number, since it uses more digits than its factorization.

19929670918756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464270 (or 2232135 counting only the distinct ones).

The product of its (nonzero) digits is 925888320, while the sum is 79.

The spelling of 19929670918756 in words is "nineteen trillion, nine hundred twenty-nine billion, six hundred seventy million, nine hundred eighteen thousand, seven hundred fifty-six".