19828216426 has 4 divisors (see below), whose sum is σ = 29742324642. Its totient is φ = 9914108212.

The previous prime is 19828216409. The next prime is 19828216451. The reversal of 19828216426 is 62461282891.

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., 10670683401 + 9157533025 = 103299^2 + 95695^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19828216426.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4957054105 + ... + 4957054108.

Almost surely, 2^19828216426 is an apocalyptic number.

19828216426 is a deficient number, since it is larger than the sum of its proper divisors (9914108216).

19828216426 is an equidigital number, since it uses as much as digits as its factorization.

19828216426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9914108215.

The product of its digits is 663552, while the sum is 49.

The spelling of 19828216426 in words is "nineteen billion, eight hundred twenty-eight million, two hundred sixteen thousand, four hundred twenty-six".