19917690629776 has 15 divisors (see below), whose sum is σ = 38590560182883. Its totient is φ = 9958836389040.

The previous prime is 19917690629761. The next prime is 19917690629777. The reversal of 19917690629776 is 67792609671991.

The square root of 19917690629776 is 4462924.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19917690629696 and 19917690629705.

It is not an unprimeable number, because it can be changed into a prime (19917690629777) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 17293831 + ... + 18409561.

Almost surely, 2^{19917690629776} is an apocalyptic number.

19917690629776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19917690629776 is the 4462924-th square number.

It is an amenable number.

19917690629776 is a deficient number, since it is larger than the sum of its proper divisors (18672869553107).

19917690629776 is an frugal number, since it uses more digits than its factorization.

19917690629776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231470 (or 1115733 counting only the distinct ones).

The product of its (nonzero) digits is 972182736, while the sum is 79.

The spelling of 19917690629776 in words is "nineteen trillion, nine hundred seventeen billion, six hundred ninety million, six hundred twenty-nine thousand, seven hundred seventy-six".