19777694448 has 20 divisors (see below), whose sum is σ = 51092377448. Its totient is φ = 6592564800.

The previous prime is 19777694407. The next prime is 19777694449. The reversal of 19777694448 is 84449677791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19777694449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206017603 + ... + 206017698.

Almost surely, 2^19777694448 is an apocalyptic number.

It is an amenable number.

19777694448 is an abundant number, since it is smaller than the sum of its proper divisors (31314683000).

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

19777694448 is a wasteful number, since it uses less digits than its factorization.

19777694448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412035312 (or 412035306 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 66.

The spelling of 19777694448 in words is "nineteen billion, seven hundred seventy-seven million, six hundred ninety-four thousand, four hundred forty-eight".