19730570557 has 2 divisors, whose sum is σ = 19730570558. Its totient is φ = 19730570556.

The previous prime is 19730570513. The next prime is 19730570569. The reversal of 19730570557 is 75507503791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17249932921 + 2480637636 = 131339^2 + 49806^2 .

It is a cyclic number.

It is not a de Polignac number, because 19730570557 - 2⁷ = 19730570429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19730570557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19730580557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9865285278 + 9865285279.

It is an arithmetic number, because the mean of its divisors is an integer number (9865285279).

Almost surely, 2^19730570557 is an apocalyptic number.

It is an amenable number.

19730570557 is a deficient number, since it is larger than the sum of its proper divisors (1).

19730570557 is an equidigital number, since it uses as much as digits as its factorization.

19730570557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1157625, while the sum is 49.

The spelling of 19730570557 in words is "nineteen billion, seven hundred thirty million, five hundred seventy thousand, five hundred fifty-seven".