19697086656 has 448 divisors, whose sum is σ = 66158668800. Its totient is φ = 5700575232.

The previous prime is 19697086631. The next prime is 19697086657. The reversal of 19697086656 is 65668079691.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19697086593 and 19697086602.

It is not an unprimeable number, because it can be changed into a prime (19697086657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34616740 + ... + 34617308.

It is an arithmetic number, because the mean of its divisors is an integer number (147675600).

Almost surely, 2^19697086656 is an apocalyptic number.

19697086656 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 19697086656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33079334400).

19697086656 is an abundant number, since it is smaller than the sum of its proper divisors (46461582144).

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

19697086656 is a wasteful number, since it uses less digits than its factorization.

19697086656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 19697086656 in words is "nineteen billion, six hundred ninety-seven million, eighty-six thousand, six hundred fifty-six".