19790519426 has 4 divisors (see below), whose sum is σ = 29685779142. Its totient is φ = 9895259712.

The previous prime is 19790519423. The next prime is 19790519461. The reversal of 19790519426 is 62491509791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19677075625 + 113443801 = 140275^2 + 10651^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19790519423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4947629855 + ... + 4947629858.

Almost surely, 2^19790519426 is an apocalyptic number.

19790519426 is a deficient number, since it is larger than the sum of its proper divisors (9895259716).

19790519426 is an equidigital number, since it uses as much as digits as its factorization.

19790519426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9895259715.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 19790519426 in words is "nineteen billion, seven hundred ninety million, five hundred nineteen thousand, four hundred twenty-six".