19669849056 has 576 divisors, whose sum is σ = 69764224320. Its totient is φ = 5352652800.

The previous prime is 19669848983. The next prime is 19669849057. The reversal of 19669849056 is 65094896691.

19669849056 is a `hidden beast` number, since 1 + 9 + 6 + 6 + 98 + 490 + 56 = 666.

It is a super-2 number, since 2×19669849056² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19669848984 and 19669849002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19669849057) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 55721776 + ... + 55722128.

It is an arithmetic number, because the mean of its divisors is an integer number (121118445).

Almost surely, 2^19669849056 is an apocalyptic number.

19669849056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19669849056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34882112160).

19669849056 is an abundant number, since it is smaller than the sum of its proper divisors (50094375264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19669849056 is a wasteful number, since it uses less digits than its factorization.

19669849056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 19669849056 in words is "nineteen billion, six hundred sixty-nine million, eight hundred forty-nine thousand, fifty-six".