19651256623 has 2 divisors, whose sum is σ = 19651256624. Its totient is φ = 19651256622.

The previous prime is 19651256587. The next prime is 19651256629. The reversal of 19651256623 is 32665215691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19651256623 - 2¹³ = 19651248431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19651256629) 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, 9825628311 + 9825628312.

It is an arithmetic number, because the mean of its divisors is an integer number (9825628312).

Almost surely, 2^19651256623 is an apocalyptic number.

19651256623 is a deficient number, since it is larger than the sum of its proper divisors (1).

19651256623 is an equidigital number, since it uses as much as digits as its factorization.

19651256623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 46.

The spelling of 19651256623 in words is "nineteen billion, six hundred fifty-one million, two hundred fifty-six thousand, six hundred twenty-three".