19773211968 has 140 divisors (see below), whose sum is σ = 58743738240. Its totient is φ = 6576484608.

The previous prime is 19773211951. The next prime is 19773212027. The reversal of 19773211968 is 86911237791.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2479155 + ... + 2487117.

Almost surely, 2^19773211968 is an apocalyptic number.

19773211968 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 19773211968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29371869120).

19773211968 is an abundant number, since it is smaller than the sum of its proper divisors (38970526272).

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

19773211968 is an equidigital number, since it uses as much as digits as its factorization.

19773211968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8466 (or 8447 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The spelling of 19773211968 in words is "nineteen billion, seven hundred seventy-three million, two hundred eleven thousand, nine hundred sixty-eight".