19926365909 has 2 divisors, whose sum is σ = 19926365910. Its totient is φ = 19926365908.

The previous prime is 19926365897. The next prime is 19926365917. The reversal of 19926365909 is 90956362991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19458855025 + 467510884 = 139495^2 + 21622^2 .

It is a cyclic number.

It is not a de Polignac number, because 19926365909 - 2¹² = 19926361813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19926365959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9963182954 + 9963182955.

It is an arithmetic number, because the mean of its divisors is an integer number (9963182955).

Almost surely, 2^19926365909 is an apocalyptic number.

It is an amenable number.

19926365909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19926365909 is an equidigital number, since it uses as much as digits as its factorization.

19926365909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7085880, while the sum is 59.

The spelling of 19926365909 in words is "nineteen billion, nine hundred twenty-six million, three hundred sixty-five thousand, nine hundred nine".