19439623057 has 2 divisors, whose sum is σ = 19439623058. Its totient is φ = 19439623056.

The previous prime is 19439623037. The next prime is 19439623087. The reversal of 19439623057 is 75032693491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17056621201 + 2383001856 = 130601^2 + 48816^2 .

It is a cyclic number.

It is not a de Polignac number, because 19439623057 - 2⁷ = 19439622929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19439623057.

It is not a weakly prime, because it can be changed into another prime (19439623037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9719811528 + 9719811529.

It is an arithmetic number, because the mean of its divisors is an integer number (9719811529).

Almost surely, 2^19439623057 is an apocalyptic number.

It is an amenable number.

19439623057 is a deficient number, since it is larger than the sum of its proper divisors (1).

19439623057 is an equidigital number, since it uses as much as digits as its factorization.

19439623057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 49.

The spelling of 19439623057 in words is "nineteen billion, four hundred thirty-nine million, six hundred twenty-three thousand, fifty-seven".