19772519650994 has 24 divisors (see below), whose sum is σ = 32966439847740. Its totient is φ = 8886525676160.

The previous prime is 19772519650993. The next prime is 19772519651009. The reversal of 19772519650994 is 49905691527791.

It can be written as a sum of positive squares in 2 ways, for example, as 17851005252025 + 1921514398969 = 4225045^2 + 1386187^2 .

It is not an unprimeable number, because it can be changed into a prime (19772519650993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 458993219 + ... + 459036294.

Almost surely, 2^{19772519650994} is an apocalyptic number.

19772519650994 is a deficient number, since it is larger than the sum of its proper divisors (13193920196746).

19772519650994 is a wasteful number, since it uses less digits than its factorization.

19772519650994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918029626 (or 918029615 counting only the distinct ones).

The product of its (nonzero) digits is 385786800, while the sum is 74.

The spelling of 19772519650994 in words is "nineteen trillion, seven hundred seventy-two billion, five hundred nineteen million, six hundred fifty thousand, nine hundred ninety-four".