19864626479 has 2 divisors, whose sum is σ = 19864626480. Its totient is φ = 19864626478.

The previous prime is 19864626461. The next prime is 19864626487. The reversal of 19864626479 is 97462646891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19864626479 - 2¹⁶ = 19864560943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19864626449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9932313239 + 9932313240.

It is an arithmetic number, because the mean of its divisors is an integer number (9932313240).

Almost surely, 2^19864626479 is an apocalyptic number.

19864626479 is a deficient number, since it is larger than the sum of its proper divisors (1).

19864626479 is an equidigital number, since it uses as much as digits as its factorization.

19864626479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 62.

The spelling of 19864626479 in words is "nineteen billion, eight hundred sixty-four million, six hundred twenty-six thousand, four hundred seventy-nine".