19205900669 has 2 divisors, whose sum is σ = 19205900670. Its totient is φ = 19205900668.

The previous prime is 19205900647. The next prime is 19205900711. The reversal of 19205900669 is 96600950291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10102260100 + 9103640569 = 100510^2 + 95413^2 .

It is a cyclic number.

It is not a de Polignac number, because 19205900669 - 2¹² = 19205896573 is a prime.

It is a super-2 number, since 2×19205900669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19205900629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9602950334 + 9602950335.

It is an arithmetic number, because the mean of its divisors is an integer number (9602950335).

Almost surely, 2^19205900669 is an apocalyptic number.

It is an amenable number.

19205900669 is a deficient number, since it is larger than the sum of its proper divisors (1).

19205900669 is an equidigital number, since it uses as much as digits as its factorization.

19205900669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The spelling of 19205900669 in words is "nineteen billion, two hundred five million, nine hundred thousand, six hundred sixty-nine".