19666772896 has 12 divisors (see below), whose sum is σ = 38718959202. Its totient is φ = 9833386432.

The previous prime is 19666772857. The next prime is 19666772897. The reversal of 19666772896 is 69827766691.

It can be written as a sum of positive squares in only one way, i.e., 18632250000 + 1034522896 = 136500^2 + 32164^2 .

It is a super-2 number, since 2×19666772896² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19666772897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307293295 + ... + 307293358.

Almost surely, 2^19666772896 is an apocalyptic number.

19666772896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19666772896 is a deficient number, since it is larger than the sum of its proper divisors (19052186306).

19666772896 is an equidigital number, since it uses as much as digits as its factorization.

19666772896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614586663 (or 614586655 counting only the distinct ones).

The product of its digits is 82301184, while the sum is 67.

The spelling of 19666772896 in words is "nineteen billion, six hundred sixty-six million, seven hundred seventy-two thousand, eight hundred ninety-six".