19819505722 has 4 divisors (see below), whose sum is σ = 29729258586. Its totient is φ = 9909752860.

The previous prime is 19819505711. The next prime is 19819505731. The reversal of 19819505722 is 22750591891.

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., 19672587081 + 146918641 = 140259^2 + 12121^2 .

It is an unprimeable number.

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, 4954876429 + ... + 4954876432.

Almost surely, 2^19819505722 is an apocalyptic number.

19819505722 is a deficient number, since it is larger than the sum of its proper divisors (9909752864).

19819505722 is an equidigital number, since it uses as much as digits as its factorization.

19819505722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909752863.

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 19819505722 in words is "nineteen billion, eight hundred nineteen million, five hundred five thousand, seven hundred twenty-two".