19790866368 has 252 divisors, whose sum is σ = 71065842120. Its totient is φ = 5219472384.

The previous prime is 19790866363. The next prime is 19790866411. The reversal of 19790866368 is 86366809791.

19790866368 is a `hidden beast` number, since 197 + 9 + 0 + 86 + 6 + 368 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

It is a super-2 number, since 2×19790866368² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19790866363) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 339943 + ... + 393881.

It is an arithmetic number, because the mean of its divisors is an integer number (282007310).

Almost surely, 2^19790866368 is an apocalyptic number.

19790866368 is a gapful number since it is divisible by the number (18) 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 19790866368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35532921060).

19790866368 is an abundant number, since it is smaller than the sum of its proper divisors (51274975752).

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

19790866368 is a wasteful number, since it uses less digits than its factorization.

19790866368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53984 (or 53964 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 19790866368 in words is "nineteen billion, seven hundred ninety million, eight hundred sixty-six thousand, three hundred sixty-eight".