19655904761 has 2 divisors, whose sum is σ = 19655904762. Its totient is φ = 19655904760.

The previous prime is 19655904661. The next prime is 19655904791. The reversal of 19655904761 is 16740955691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19449091600 + 206813161 = 139460^2 + 14381^2 .

It is a cyclic number.

It is not a de Polignac number, because 19655904761 - 2³⁴ = 2476035577 is a prime.

It is not a weakly prime, because it can be changed into another prime (19655904791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9827952380 + 9827952381.

It is an arithmetic number, because the mean of its divisors is an integer number (9827952381).

Almost surely, 2^19655904761 is an apocalyptic number.

It is an amenable number.

19655904761 is a deficient number, since it is larger than the sum of its proper divisors (1).

19655904761 is an equidigital number, since it uses as much as digits as its factorization.

19655904761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 19655904761 in words is "nineteen billion, six hundred fifty-five million, nine hundred four thousand, seven hundred sixty-one".